Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	First Quarter Ended
	March 27, 2015			March 28, 2014
	($ in millions)
Earnings:
Income before income taxes	$	159		$	248
Net income attributable to noncontrolling interests		(4	)		(2	)
Income before income taxes after noncontrolling interests	$	155		$	246
Add:
Interest expense		43			42
Amortization of debt expense		1			1
Interest component of rent expense		15			13
Earnings	$	214		$	302
Fixed charges:
Interest expense		43			42
Amortization of debt expense		1			1
Interest component of rent expense		15			13
Fixed charges	$	59		$	56
Ratio of earnings to fixed charges		3.6	x		5.4	x