Exhibit 12

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

	Year-to-Date Ended
	September 25, 2009
	($ in millions)
Earnings:
Income before income taxes	$	1,020
Less: Net income attributable to noncontrolling interests		(7	)
Income before income taxes after noncontrolling interests	$	1,013
Add:
Interest expense		195
Amortization of debt expense		8
Interest component of rent expense		45
Earnings	$	1,261
Fixed charges:
Interest expense		195
Amortization of debt expense		8
Interest component of rent expense		45
Fixed charges	$	248
Ratio of earnings to fixed charges		5.08