Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	First Half Ended June 29, 2012
	($ in millions)
Earnings:
Income before income taxes	$	627
Less: Net income attributable to noncontrolling interests		(5	)
Income before income taxes after noncontrolling interests	$	622
Add:
Interest expense		101
Amortization of debt expense		3
Interest component of rent expense		28
Earnings	$	754
Fixed charges:
Interest expense		101
Amortization of debt expense		3
Interest component of rent expense		28
Fixed charges	$	132
Ratio of earnings to fixed charges		5.7	x