EXHIBIT 12

EXELIS INC.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Three Months Ended March 31,		Year Ended December 31,
(IN MILLIONS, EXCEPT RATIO)	2012		2011		2010		2009		2008		2007
Earnings
Income from continuing operations before income tax expense	$	121	$	537	$	696	$	700	$	657	$	438
Add Fixed Charges
Interest expense		9		10		—		1		2		—
Interest component of rental expense (a)		4		15		14		14		13		8
Total earnings available for fixed charges	$	134	$	562	$	710	$	715	$	672	$	446
Total Fixed Charges	$	13	$	25	$	14	$	15	$	15	$	8
Ratio of earnings to fixed charges		10.3		22.5		50.7		47.7		44.8		55.8

(a) Represents the portion of operating leases which management believes is a reasonable representation of an interest factor.