Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges (Unaudited)

	Year Ended December 31,
	2012		2011		2010		2009		2008
	(In millions, except ratio of earnings to fixed charges)
Earnings:
Income from continuing operations before income taxes	$	1,162	$	1,160	$	1,252	$	1,131	$	1,160
Less: Net income from continuing operations attributable to noncontrolling interests		6		9		9		9		11
Income from continuing operations before income taxes after noncontrolling interests	$	1,156	$	1,151	$	1,243	$	1,122	$	1,149
Add:
Interest expense		193		226		257		268		279
Amortization of debt expense		5		9		12		11		11
Interest component of rent expense		54		55		59		59		58
Earnings	$	1,408	$	1,441	$	1,571	$	1,460	$	1,497
Fixed charges:
Interest expense	$	193	$	226	$	257	$	268	$	279
Amortization of debt expense		5		9		12		11		11
Interest component of rent expense		54		55		59		59		58
Fixed charges	$	252	$	290	$	328	$	338	$	348
Ratio of earnings to fixed charges		5.6x		5.0x		4.8x		4.3x		4.3x