<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>0219 - Disclosure - Commitments and Contingencies</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2010 - 12/31/2010
USD ($)

USD ($) / shares
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Jan-01-2010_Dec-31-2010</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001056239</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2010-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2010-12-31T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS><UnitProperty><UnitID>USD</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>Pure</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>pure</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>USDEPS</UnitID><UnitType>Divide</UnitType><NumeratorMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></NumeratorMeasure><DenominatorMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></DenominatorMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="12 Months Ended" /><Label Id="2" Label="Dec. 31, 2010" /></Labels></Column></Columns><Rows><Row><Id>2</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><Level>0</Level><ElementName>lll_CommitmentsAndContingenciesAbstract</ElementName><ElementPrefix>lll</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>Commitments and Contingencies.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Commitments and Contingencies.</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Commitments and Contingencies [Abstract]</Label></Row><Row><Id>3</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>us-gaap_CommitmentsAndContingenciesDisclosureTextBlock</ElementName><ElementPrefix>us-gaap</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>verboselabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
   &lt;!-- Begin Block Tagged Note 19 - us-gaap:CommitmentsAndContingenciesDisclosureTextBlock--&gt;
   &lt;div style="margin-left: 0%"&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"&gt;
   &lt;tr&gt;
       &lt;td width="3%"&gt;&lt;/td&gt;
       &lt;td width="97%"&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="top"&gt;
       &lt;td&gt;
       &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;19.&amp;#160;&lt;/font&gt;&lt;/b&gt;
   &lt;/td&gt;
       &lt;td&gt;
       &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Commitments
       and Contingencies&lt;/font&gt;&lt;/b&gt;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Non-Cancelable
       Operating Leases&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company leases certain facilities and equipment under
       agreements expiring at various dates through 2028. Certain
       leases contain renewal options or escalation clauses providing
       for increased rental payments based upon maintenance, utility
       and tax increases. No lease agreement imposes a restriction on
       the Company&amp;#8217;s ability to pay dividends, engage in debt or
       equity financing transactions, or enter into further lease
       agreements.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The following table presents future minimum payments under
       non-cancelable operating leases with initial or remaining terms
       in excess of one year at December&amp;#160;31, 2010.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;table border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent; text-align: left"&gt;
   &lt;!-- Table Width Row BEGIN --&gt;
   &lt;tr style="font-size: 1pt" valign="bottom"&gt;
       &lt;td width="74%"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=01 type=maindata --&gt;
       &lt;td width="1%"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=02 type=gutter --&gt;
       &lt;td width="1%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=02 type=lead --&gt;
       &lt;td width="7%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=02 type=body --&gt;
       &lt;td width="1%" align="left"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=02 type=hang1 --&gt;
       &lt;td width="1%"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=gutter --&gt;
       &lt;td width="1%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=lead --&gt;
       &lt;td width="7%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=body --&gt;
       &lt;td width="1%" align="left"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=03 type=hang1 --&gt;
       &lt;td width="1%"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=gutter --&gt;
       &lt;td width="1%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=lead --&gt;
       &lt;td width="3%" align="right"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=body --&gt;
       &lt;td width="1%" align="left"&gt;&amp;#160;&lt;/td&gt;&lt;!-- colindex=04 type=hang1 --&gt;
   &lt;/tr&gt;
   &lt;!-- Table Width Row END --&gt;
   &lt;!-- TableOutputHead --&gt;
   &lt;tr style="font-size: 8pt" valign="bottom" align="center"&gt;
   &lt;td nowrap="nowrap" align="center" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
       &lt;b&gt;Real Estate&lt;/b&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
       &lt;b&gt;Equipment&lt;/b&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"&gt;
       &lt;b&gt;Total&lt;/b&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr style="font-size: 8pt" valign="bottom" align="center"&gt;
   &lt;td nowrap="nowrap" align="center" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td colspan="10" align="center" valign="bottom"&gt;
       &lt;b&gt;(in millions)&lt;/b&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr style="line-height: 3pt; font-size: 1pt"&gt;
   &lt;td&gt;&amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;!-- TableOutputBody --&gt;
   &lt;tr valign="bottom" style="background: #cceeff"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       2011
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       169
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       20
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       189
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       2012
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       119
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       17
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       136
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="background: #cceeff"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       2013
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       98
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       10
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       108
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       2014
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       83
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       7
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       90
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="background: #cceeff"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       2015
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       57
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       6
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       63
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom"&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       Thereafter
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       128
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       16
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       144
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="font-size: 1pt"&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="background: #cceeff"&gt;
   &lt;td align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       Total minimum payments required
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       654
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       76
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       730
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom"&gt;
   &lt;td align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       Less: Sublease rentals under non-cancelable leases
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       16
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       &amp;#8212;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       16
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="font-size: 1pt"&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 1px solid #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="background: #cceeff"&gt;
   &lt;td align="left" valign="bottom"&gt;
   &lt;div style="text-indent: -9pt; margin-left: 9pt"&gt;
       Net minimum payments required
   &lt;/div&gt;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       &amp;#160;638
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       &amp;#160;76
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
       $
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="right" valign="bottom"&gt;
       &amp;#160;714
   &lt;/td&gt;
   &lt;td nowrap="nowrap" align="left" valign="bottom"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="bottom" style="font-size: 1pt"&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td style="border-top: 3px double #000000"&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;td&gt;
   &amp;#160;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       Rent expense, net of sublease income, was $176&amp;#160;million for
       2010, $170&amp;#160;million for 2009, and $166&amp;#160;million for 2008.
   &lt;/div&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Letters
       of Credit&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company enters into standby letters of credit with financial
       institutions covering performance and financial guarantees
       pursuant to contractual arrangements with certain customers. The
       Company had total outstanding letters of credit aggregating to
       $394&amp;#160;million, of which $17&amp;#160;million reduces the amount
       of available borrowings to the Company under the Revolving
       Credit Facility at December&amp;#160;31, 2010, and
       $360&amp;#160;million, of which, $32&amp;#160;million reduced the amount
       of available borrowings under the Revolving Credit Facility at
       December&amp;#160;31, 2009. These letters of credit may be drawn
       upon in the event of the Company&amp;#8217;s nonperformance.
   &lt;/div&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Guarantees&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company, from time to time, enters into contractual
       guarantees that arise in connection with its business
       acquisitions, dispositions, and other contractual arrangements
       in the normal course of business.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       In connection with the Company&amp;#8217;s acquisition of L-3
       Communications MAPPS Inc. in 2005, the Company acquired a 47.5%
       interest in FAST Holdings Limited (FAST), a joint venture
       corporation. FAST has been contracted to provide and operate
       training facilities and equipment for the United Kingdom&amp;#8217;s
       Astute Class&amp;#160;Submarine Training Service program.
   The Company has guaranteed 50% of certain bank debt borrowed by
       FAST to finance its activities on this program. At
       December&amp;#160;31,&amp;#160;2010, the Company&amp;#8217;s guarantee
       amounted to $44&amp;#160;million. The Company expects to be released
       from the guarantee upon customer acceptance of all contract
       deliverables, which is expected to occur no later than the
       second quarter of 2011.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company has two existing real estate lease agreements, which
       include residual guarantee amounts, expiring on August&amp;#160;31,
       2011 and are accounted for as operating leases. On or before the
       lease expiration date, the Company can exercise options under
       the lease agreements to either renew the leases, purchase both
       properties for $28&amp;#160;million, or sell both properties on
       behalf of the lessor (the &amp;#8220;Sale Option&amp;#8221;). If the
       Company elects the Sale Option, the Company must pay the lessor
       a residual guarantee amount of $23&amp;#160;million for both
       properties, on or before the lease expiration date. In addition,
       at the time both properties are sold, the Company must pay the
       lessor a supplemental rent payment equal to the gross sales
       proceeds in excess of the residual guarantee, provided that such
       amount shall not exceed $5&amp;#160;million. For these real estate
       lease agreements, if the gross sales proceeds are less than the
       sum of the residual guarantee amount and the supplemental rent
       payment, the Company is required to pay a supplemental rent
       payment to the extent the reduction in the fair value of the
       properties is demonstrated by an independent appraisal to have
       been caused by the Company&amp;#8217;s failure to properly maintain
       the properties. The aggregate residual guarantee amounts equal
       $23&amp;#160;million and are included in the future minimum payments
       under non-cancelable real estate operating lease payments
       relating to the expiration dates of such leases.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company has a contract to provide and operate for the
       U.S.&amp;#160;Air Force (USAF) a full-service training facility,
       including simulator systems adjacent to a USAF base in Oklahoma.
       The Company acted as the construction agent on behalf of the
       third-party owner-lessors for procurement and construction for
       the simulator systems, which were completed and delivered in
       August 2002. The Company, as lessee, entered into operating
       lease agreements for a term of 15&amp;#160;years for the simulator
       systems with the owner-lessors. At the end of the lease term,
       the Company may elect to purchase the simulator systems at fair
       market value, which can be no less than $7&amp;#160;million and no
       greater than $21&amp;#160;million. If the Company does not elect to
       purchase the simulator systems on the date of expiration
       (July&amp;#160;15, 2017), the Company shall pay to the lessor, as
       additional rent, $3&amp;#160;million and return the simulator
       systems to the lessors.
   &lt;/div&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Environmental
       Matters&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       Management continually assesses the Company&amp;#8217;s obligations
       with respect to applicable environmental protection laws,
       including those obligations assumed in connection with certain
       business acquisitions. While it is difficult to determine the
       timing and ultimate cost to be incurred by the Company in order
       to comply with these laws, based upon available internal and
       external assessments, with respect to those environmental loss
       contingencies of which management is aware, the Company believes
       that, after considering amounts accrued, there are no
       environmental loss contingencies that, individually or in the
       aggregate, would be material to the Company&amp;#8217;s consolidated
       results of operations. The Company accrues for these
       contingencies when it is probable that a liability has been
       incurred and the amount of the liability can be reasonably
       estimated.
   &lt;/div&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Procurement
       Regulations&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       A substantial majority of the Company&amp;#8217;s revenues are
       generated from providing products and services under legally
       binding agreements or contracts with U.S.&amp;#160;Government and
       foreign government customers. U.S.&amp;#160;Government contracts are
       subject to extensive legal and regulatory requirements, and from
       time to time, agencies of the U.S.&amp;#160;Government investigate
       whether such contracts were and are being conducted in
       accordance with these requirements. The Company is currently
       cooperating with the U.S.&amp;#160;Government on several
       investigations, including those specified below, from which
       civil, criminal or administrative proceedings have or could
       result and give rise to fines, penalties, compensatory and
       treble damages, restitution
       &lt;font style="white-space: nowrap"&gt;and/or&lt;/font&gt;
       forfeitures. The Company does not currently anticipate that any
       of these investigations will have a material adverse effect,
       individually or in the aggregate, on its consolidated financial
       position, results of operations or cash flows. However, under
       U.S.&amp;#160;Government regulations, an indictment of the Company
       by a federal grand jury, or an
   administrative finding against the Company as to its present
       responsibility to be a U.S.&amp;#160;Government contractor or
       subcontractor, could result in the Company being suspended for a
       period of time from eligibility for awards of new government
       contracts or task orders or in a loss of export privileges. A
       conviction, or an administrative finding against the Company
       that satisfies the requisite level of seriousness, could result
       in debarment from contracting with the federal government for a
       specified term. In addition, all of the Company&amp;#8217;s
       U.S.&amp;#160;Government contracts: (1)&amp;#160;are subject to audit
       and various pricing and cost controls, (2)&amp;#160;include standard
       provisions for termination for the convenience of the
       U.S.&amp;#160;Government or for default, and (3)&amp;#160;are subject to
       cancellation if funds for contracts become unavailable. Foreign
       government contracts generally include comparable provisions
       relating to terminations for convenience and default, as well as
       other procurement clauses relevant to the foreign government.
   &lt;/div&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"&gt;
       &lt;b&gt;&lt;i&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Litigation
       Matters&lt;/font&gt;&lt;/i&gt;&lt;/b&gt;
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company is also subject to litigation, proceedings, claims
       or assessments and various contingent liabilities incidental to
       its businesses, including those specified below. Furthermore, in
       connection with certain business acquisitions, the Company has
       assumed some or all claims against, and liabilities of, the
       acquired business, including both asserted and unasserted claims
       and liabilities.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       In accordance with the accounting standard for contingencies,
       the Company records a liability when management believes that it
       is both probable that a liability has been incurred and the
       Company can reasonably estimate the amount of the loss.
       Generally, the loss is recorded at the amount the Company
       expects to resolve the liability. The estimated amounts of
       liabilities recorded for pending and threatened litigation are
       disclosed in Note&amp;#160;8. Amounts recoverable from insurance
       contracts or third parties are recorded as assets when deemed
       probable. At December&amp;#160;31, 2010, the Company did not record
       any amounts for recoveries from insurance contracts or third
       parties in connection with the amount of liabilities recorded
       for pending and threatened litigation. Legal defense costs are
       expensed as incurred. The Company believes it has recorded
       adequate provisions for its litigation matters. The Company
       reviews these provisions quarterly and adjusts these provisions
       to reflect the impact of negotiations, settlements, rulings,
       advice of legal counsel and other information and events
       pertaining to a particular matter. While it is reasonably
       possible that an unfavorable outcome may occur in one or more of
       the following matters, unless otherwise stated below, the
       Company believes that it is not probable that a loss has been
       incurred in any of these matters. An estimate of loss or range
       of loss is disclosed for a particular litigation matter when
       such amount or amounts can be reasonably estimated and no loss
       has been accrued. The Company believes that any damage amounts
       claimed in the specific matters discussed below do not
       constitute reasonable estimates of loss. Although the Company
       believes that it has valid defenses with respect to legal
       matters and investigations pending against it, the results of
       litigation can be difficult to predict, including those
       involving jury trials. Accordingly, our current judgment as to
       the likelihood of our loss (or our current estimate as to the
       potential range of loss, if applicable) with respect to any
       particular litigation matter may turn out to be wrong.
       Therefore, it is possible that the financial position, results
       of operations or cash flows of the Company could be materially
       adversely affected in any particular period by the unfavorable
       resolution of one or more of these or other contingencies.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Kalitta Air.&lt;/i&gt;&amp;#160;On January&amp;#160;31, 1997, a predecessor
       of Kalitta Air filed a lawsuit in the U.S.&amp;#160;District Court
       for the Northern District of California (the trial court)
       asserting, among other things, negligence and negligent
       misrepresentation against Central Texas Airborne Systems, Inc.
       (CTAS), a predecessor to L-3 Integrated Systems (L-3 IS), in
       connection with work performed by a predecessor to CTAS to
       convert two Boeing 747 aircraft from passenger configuration to
       cargo freighters. The work was performed using Supplemental Type
       Certificates (STCs) issued in 1988 by the Federal Aviation
       Administration (FAA). In 1996, following completion of the work,
       the FAA issued an airworthiness directive with respect to the
       STCs that effectively grounded the aircraft. On August&amp;#160;11,
       2000, the trial court granted CTAS&amp;#8217; motion for summary
       judgment as to negligence, dismissing that claim. In January
       2001, after a ruling by the trial court that excluded certain
       evidence from trial, a jury rendered a unanimous defense verdict
       in favor of CTAS on the negligent misrepresentation claim. On
       December&amp;#160;10, 2002, the U.S.&amp;#160;Court of Appeals for the
       Ninth Circuit (the Court of Appeals) reversed the trial
       court&amp;#8217;s decisions as to summary judgment and the exclusion
       of evidence, and remanded
   the case for a new trial on both the negligence and negligent
       misrepresentation claims. The retrial ended on March&amp;#160;2,
       2005 with a deadlocked jury and mistrial. On July&amp;#160;22, 2005,
       the trial court granted CTAS&amp;#8217; motion for judgment as a
       matter of law as to negligence, dismissing that claim, and
       denied CTAS&amp;#8217; motion for judgment as a matter of law as to
       negligent misrepresentation. On October&amp;#160;8, 2008, the Court
       of Appeals reversed the trial court&amp;#8217;s dismissal of the
       negligence claim and affirmed the trial court&amp;#8217;s ruling as
       to the negligent misrepresentation claim. As a result, the case
       was remanded to the trial court to reconsider the negligence
       claim and for further proceedings on the negligent
       misrepresentation claim. The trial court held a new hearing on
       CTAS&amp;#8217; motion to dismiss the negligence claim on
       April&amp;#160;30, 2009, after which it determined to take the
       matter under advisement. The case is currently scheduled to go
       to a third jury trial on October&amp;#160;31, 2011. The parties have
       participated in court-ordered mediations from time to time, and
       are expected to participate in future court-ordered mediations
       prior to trial, but to date such mediations have not resulted in
       a mutually acceptable resolution of this matter. In connection
       with these mediations, Kalitta Air has claimed it may seek
       damages at the third trial of between $430&amp;#160;million and
       $900&amp;#160;million, including between $200&amp;#160;million and
       $240&amp;#160;million of pre-judgment interest. CTAS&amp;#8217; insurance
       carrier has accepted defense of this matter and has retained
       counsel, subject to a reservation of rights by the insurer to
       dispute its obligations under the applicable insurance policies
       in the event of a finding against L-3. The Company believes that
       it has meritorious defenses to the claims asserted and the
       damages sought and intends to defend itself vigorously.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Titan Government Investigation.&lt;/i&gt;&amp;#160;In October 2002, The
       Titan Corporation (Titan) received a grand jury subpoena from
       the Antitrust Division of the DoJ requesting the production of
       documents relating to information technology services performed
       for the U.S.&amp;#160;Air Force at Hanscom Air Force Base in
       Massachusetts and Wright-Patterson Air Force Base in Ohio. The
       Company acquired Titan in July 2005. The Company was recently
       advised by the DoJ that it has closed this matter without taking
       action against the Company.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;CyTerra Government Investigation.&lt;/i&gt;&amp;#160;Since November
       2006, CyTerra has been served with civil and Grand Jury
       subpoenas by the DoD Office of the Inspector General and the DoJ
       and has been asked to facilitate employee interviews. The
       Company is cooperating fully with the U.S.&amp;#160;Government. The
       Company believes that it is entitled to indemnification for any
       course of defense related to this matter out of, and has made a
       claim against, a $15&amp;#160;million escrow fund established in
       connection with the Company&amp;#8217;s acquisition of CyTerra in
       March 2006.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Bashkirian Airways.&lt;/i&gt;&amp;#160;On July&amp;#160;1, 2004, lawsuits
       were filed on behalf of the estates of 31 Russian children in
       the state courts of Washington, Arizona, California, Florida,
       New York and New Jersey against Honeywell, Honeywell TCAS,
       Thales USA, Thales France, the Company and Aviation
       Communications&amp;#160;&amp;#038; Surveillance Systems (ACSS), which is
       a joint venture of L-3 and Thales. The suits relate to the crash
       over southern Germany of Bashkirian Airways Tupelov TU 154M
       aircraft and a DHL Boeing 757 cargo aircraft. On-board the
       Tupelov aircraft were 9 crew members and 60 passengers,
       including 45 children. The Boeing aircraft carried a crew of
       two. Both aircraft were equipped with Honeywell/ACSS Model 2000,
       Change 7 Traffic Collision and Avoidance Systems (TCAS). Sensing
       the other aircraft, the on-board DHL TCAS instructed the DHL
       pilot to descend, and the Tupelov on-board TCAS instructed the
       Tupelov pilot to climb. However, the Swiss air traffic
       controller ordered the Tupelov pilot to descend. The Tupelov
       pilot disregarded the on-board TCAS and put the Tupelov aircraft
       into a descent striking the DHL aircraft in midair at
       approximately 35,000&amp;#160;feet. All crew and passengers of both
       planes were lost. Investigations by the National Transportation
       Safety Board after the crash revealed that both TCAS units were
       performing as designed. The suits allege negligence and strict
       product liability based upon the design of the units and the
       training provided to resolve conflicting commands and seek
       approximately $315&amp;#160;million in damages, including
       $150&amp;#160;million in punitive damages. The Company&amp;#8217;s
       insurers have accepted defense of this matter and have retained
       counsel. The matters were consolidated in the U.S.&amp;#160;District
       Court for the District of New Jersey, which has dismissed the
       actions on the basis of forum non conveniens. The plaintiffs
       re-filed a complaint on April&amp;#160;23, 2007 with the Barcelona
       Court&amp;#8217;s Registry in Spain. On March&amp;#160;9, 2010, the court
       ruled in favor of the plaintiffs and entered judgment against
       ACSS in the amount of approximately $6.7&amp;#160;million, all of
       which represented compensatory damages. The Company believes
       that the verdict and the damages awarded are inconsistent with
       the law and evidence
   presented. Accordingly, ACSS filed an appeal of this ruling on
       April&amp;#160;27, 2010. The plaintiffs also filed an appeal of this
       ruling on the same date.
   &lt;/div&gt;
   &lt;div style="margin-top: 10pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 1%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Gol Airlines.&lt;/i&gt;&amp;#160;A complaint was filed on
       November&amp;#160;7, 2006 in the U.S.&amp;#160;District Court for the
       Eastern District of New&amp;#160;York against ExcelAire, Joseph
       Lepore, Jan Paul Paladino, and Honeywell. On October&amp;#160;23,
       2007, an amended complaint was filed to include Lockheed,
       Raytheon, Amazon Technologies and ACSS. The complaints relate to
       the September&amp;#160;29, 2006 airplane crash over Brazil of a
       Boeing
       &lt;font style="white-space: nowrap"&gt;737-800&lt;/font&gt;
       operated by GOL Linhas Aereas Inteligentes, S.A. and an Embraer
       600 business jet operated by ExcelAire. The complaints allege
       that ACSS designed the TCAS on the ExcelAire jet, and assert
       claims of negligence, strict products liability and breach of
       warranty against ACSS based on the design of the TCAS and the
       instructions provided for its use. The complaints seek
       unspecified monetary damages, including punitive damages. The
       Company&amp;#8217;s insurers have accepted defense of this matter and
       have retained counsel. On July&amp;#160;2, 2008, the District Court
       dismissed the actions on the basis of forum non conveniens on
       the grounds that Brazil was the location of the accident and is
       more convenient for witnesses and document availability. On
       December&amp;#160;2, 2009, the U.S.&amp;#160;Court of Appeals for the
       Second Circuit upheld this decision. Some of the plaintiffs
       re-filed their complaints in the Lower Civil Court in the
       Judicial District of Peixoto de Azevedo in Brazil on
       July&amp;#160;3, 2009.
   &lt;/div&gt;
   &lt;/div&gt;
</NonNumbericText><NonNumericTextHeader>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
   &lt;!-- Begin Block Tagged Note</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Includes disclosure of commitments and contingencies. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name FASB Interpretation (FIN)
 -Number 14
 -Paragraph 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 5
 -Paragraph 9, 10, 11, 12

</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Commitments and Contingencies</Label></Row></Rows><Footnotes /><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows><ReportName>Commitments and Contingencies</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>false</HasCustomUnits><SharesShouldBeRounded>true</SharesShouldBeRounded></InstanceReport>
