Exhibit 12

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

		First Quarter Ended
	March 26, 2010
		($ in millions)
Earnings:
Income before income taxes		$	350
Less: Net income attributable to noncontrolling interests			(1	)
Income before income taxes after noncontrolling interests		$	349
Add:
Interest expense			61
Amortization of debt expense			3
Interest component of rent expense			14
Earnings		$	427
Fixed charges:
Interest expense			61
Amortization of debt expense			3
Interest component of rent expense			14
Fixed charges		$	78
Ratio of earnings to fixed charges			5.5	x