Exhibit 12

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

	First Half Ended
	June 26, 2009
	($ in millions)
Earnings:
Income before income taxes	$	667
Less: Net income attributable to noncontrolling interests		(4	)
Income before income taxes after noncontrolling interests	$	663
Add:
Interest expense		129
Amortization of debt expense		6
Interest component of rent expense		30
Earnings	$	828
Fixed charges:
Interest expense		129
Amortization of debt expense		6
Interest component of rent expense		30
Fixed charges	$	165
Ratio of earnings to fixed charges		5.02