L-3 Communications Essco S-3ASR Automatic shelf registration

Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES

	First Quarter Ended March 25, 2016			Year Ended December 31,
				2015			2014			2013			2012			2011
	(In millions, except ratio of earnings to fixed charges)
Earnings:
Income from continuing operations before income taxes	$	215		$	322		$	872		$	980		$	1,053		$	1,055
Less: Net income from continuing operations attributable to noncontrolling interests		(3	)		(15	)		(13	)		(9	)		(6	)		(9	)
Income from continuing operations before income taxes after noncontrolling interests	$	212		$	307		$	859		$	971		$	1,047		$	1,046
Add:
Interest expense		39			181			171			171			191			222
Amortization of debt expense		2			8			7			6			7			13
Interest component of rent expense		9			42			47			47			54			55
Earnings	$	262		$	538		$	1,084		$	1,195		$	1,299		$	1,336
Fixed charges:
Interest expense	$	39		$	181		$	171		$	171		$	191		$	222
Amortization of debt expense		2			8			7			6			7			13
Interest component of rent expense		9			42			47			47			54			55
Fixed charges	$	50		$	231		$	225		$	224		$	252		$	290
Ratio of earnings to fixed charges		5.2 x			2.3 x			4.8 x			5.3 x			5.2 x			4.6 x