Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	First Half Ended June 28, 2013
	($ in millions)
Earnings:
Income before income taxes	$	541
Less: Net income attributable to noncontrolling interests		(2	)
Income before income taxes after noncontrolling interests	$	539
Add:
Interest expense		85
Amortization of debt expense		2
Interest component of rent expense		19
Earnings	$	645
Fixed charges:
Interest expense		85
Amortization of debt expense		2
Interest component of rent expense		19
Fixed charges	$	106
Ratio of earnings to fixed charges		6.1	x