Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	Year-to-Date Ended September 27, 2013
	($ in millions)
Earnings:
Income before income taxes	$	814
Less: Net income attributable to noncontrolling interests		(6	)
Income before income taxes after noncontrolling interests	$	808
Add:
Interest expense		127
Amortization of debt expense		4
Interest component of rent expense		29
Earnings	$	968
Fixed charges:
Interest expense		127
Amortization of debt expense		4
Interest component of rent expense		29
Fixed charges	$	160
Ratio of earnings to fixed charges		6.1	x