Exhibit 12

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

	Year-to-Date Ended
	September 30, 2011
	($ in millions)
Earnings:
Income before income taxes		$	1,016
Less: Net income attributable to noncontrolling interests			(9	)
Income before income taxes after noncontrolling interests		$	1,007
Add:
Interest expense			169
Amortization of debt expense			7
Interest component of rent expense			46
Earnings		$	1,229
Fixed charges:
Interest expense			169
Amortization of debt expense			7
Interest component of rent expense			46
Fixed charges		$	222
Ratio of earnings to fixed charges			5.5	x