Exhibit 12

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

			Nine Months Ended September 30, 2007
			($ in millions)
Earnings:
Income before income taxes				$	845.0
Add:
Interest expense					213.0
Amortization of debt expense					7.9
Interest component of rent expense					41.3
Earnings				$	1,107.2
Fixed charges:
Interest expense					213.0
Amortization of debt expense					7.9
Interest component of rent expense					41.3
Fixed charges				$	262.2
Ratio of earnings to fixed charges					4.2	x