Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges (Unaudited)

	Year Ended December 31,
	2013		2012		2011		2010		2009
	(In millions, except ratio of earnings to fixed charges)
Earnings:
Income from continuing operations before income taxes	$	1,096	$	1,162	$	1,160	$	1,252	$	1,131
Net income from continuing operations attributable to noncontrolling interests		(9)		(6)		(9)		(9)		(9)
Income from continuing operations before income taxes after noncontrolling interests	$	1,087	$	1,156	$	1,151	$	1,243	$	1,122
Add:
Interest expense		172		193		226		257		268
Amortization of debt expense		5		5		9		12		11
Interest component of rent expense		47		54		55		59		59
Earnings	$	1,311	$	1,408	$	1,441	$	1,571	$	1,460
Fixed charges:
Interest expense	$	172	$	193	$	226	$	257	$	268
Amortization of debt expense		5		5		9		12		11
Interest component of rent expense		47		54		55		59		59
Fixed charges	$	224	$	252	$	290	$	328	$	338
Ratio of earnings to fixed charges		5.9x		5.6x		5.0x		4.8x		4.3x