Exhibit 12

L-3 Communications Holdings, Inc.
and L-3 Communications Corporation
Ratio of Earnings to Fixed Charges

	Year Ended December 31,
	2008			2007			2006			2005			2004
	(in millions, except ratio of earnings to fixed charges)
Earnings:
Income from continuing operations before income taxes	$	1,431		$	1,174		$	825		$	788		$	597
Add:
Interest expense		260			286			286			199			138
Amortization of debt expense		11			10			10			5			7
Interest component of rent expense		58			56			53			41			27
Earnings	$	1,760		$	1,526		$	1,174		$	1,033		$	769
Fixed charges:
Interest expense		260			286			286			199			138
Amortization of debt expense		11			10			10			5			7
Interest component of rent expense		58			56			53			41			27
Fixed charges	$	329		$	352		$	349		$	245		$	172
Ratio of earnings to fixed charges		5.4	x		4.3	x		3.4	x		4.2	x		4.5	x