Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	Year-to-Date Ended September 28, 2012
	($ in millions)
Earnings:
Income from continuing operations before income taxes	$	847
Less: Net income from continuing operations attributable to noncontrolling interests		(3	)
Income before income taxes after noncontrolling interests	$	844
Add:
Interest expense		148
Amortization of debt expense		4
Interest component of rent expense		40
Earnings	$	1,036
Fixed charges:
Interest expense		148
Amortization of debt expense		4
Interest component of rent expense		40
Fixed charges	$	192
Ratio of earnings to fixed charges		5.4	x