Exhibit 12

L-3 Communications Holdings, Inc.
and L-3 Communications Corporation
Ratio of Earnings to Fixed Charges

	Year-to-Date Ended
	September 24, 2010
	($ in millions)
Earnings:
Income before income taxes	$	1,086
Less: Net income attributable to noncontrolling interests		(7	)
Income before income taxes after noncontrolling interests	$	1,079
Add:
Interest expense		191
Amortization of debt expense		9
Interest component of rent expense		45
Earnings	$	1,324
Fixed charges:
Interest expense		191
Amortization of debt expense		9
Interest component of rent expense		45
Fixed charges	$	245
Ratio of earnings to fixed charges		5.4	x