Exhibit 12

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

			First Quarter Ended March 28, 2008
			($ in millions, except ratio of earnings to fixed charges)
Earnings:
Income before income taxes				$	302
Add:
Interest expense					68
Amortization of debt expense					3
Interest component of rent expense					14
Earnings				$	387
Fixed charges:
Interest expense					68
Amortization of debt expense					3
Interest component of rent expense					14
Fixed charges				$	85
Ratio of earnings to fixed charges					4.6x