Exhibit 12

L-3 Communications Holdings, Inc.

and L-3 Communications Corporation

Ratio of Earnings to Fixed Charges

	Year-to-Date Ended September 26, 2014
	($ in millions)
Earnings:
Income before income taxes	$	667
Net income attributable to noncontrolling interests		(9	)
Income before income taxes after noncontrolling interests	$	658
Add:
Interest expense		125
Amortization of debt expense		4
Interest component of rent expense		44
Earnings	$	831
Fixed charges:
Interest expense		125
Amortization of debt expense		4
Interest component of rent expense		44
Fixed charges	$	173
Ratio of earnings to fixed charges		4.8	x