Exhibit 12

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

	First Half Ended
	June 27, 2008
	($ in millions)
Earnings:
Income before income taxes	$	746
Add:
Interest expense		127
Amortization of debt expense		5
Interest component of rent expense		29
Earnings	$	907
Fixed charges:
Interest expense		127
Amortization of debt expense		5
Interest component of rent expense		29
Fixed charges	$	161
Ratio of earnings to fixed charges		5.6x