Exhibit 12

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

	Year-to-Date Ended
	June 25, 2010
	($ in millions)
Earnings:
Income before income taxes	$	715
Less: Net income attributable to noncontrolling interests		(4	)
Income before income taxes after noncontrolling interests	$	711
Add:
Interest expense		130
Amortization of debt expense		6
Interest component of rent expense		28
Earnings	$	875
Fixed charges:
Interest expense		130
Amortization of debt expense		6
Interest component of rent expense		28
Fixed charges	$	164
Ratio of earnings to fixed charges		5.3	x