Exhibit 12

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

	Year-to-Date Ended
	September 26, 2008
	($ in millions)
Earnings:
Income before income taxes	$	1,083
Add:
Interest expense		192
Amortization of debt expense		8
Interest component of rent expense		43
Earnings	$	1,326
Fixed charges:
Interest expense		192
Amortization of debt expense		8
Interest component of rent expense		43
Fixed charges	$	243
Ratio of earnings to fixed charges		5.5x