Exhibit 12

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

			Three Months Ended March 31, 2007
			($ in millions, except ratio of earnings to fixed charges)
Earnings:
Income before income taxes				$	255.5
Add:
Interest expense					70.5
Amortization of debt expense					2.5
Interest component of rent expense					13.4
Earnings				$	341.9
Fixed charges:
Interest expense					70.5
Amortization of debt expense					2.5
Interest component of rent expense					13.4
Fixed charges				$	86.4
Ratio of earnings to fixed charges					4.0	x