Exhibit 12

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

			Nine Months Ended September 30, 2006
			(dollars in millions)
Earnings:
Income before income taxes				$	554.5
Add:
Interest expense					214.0
Amortization of debt expense					7.6
Interest component of rent expense					39.4
Earnings				$	815.5
Fixed charges:
Interest expense					214.0
Amortization of debt expense					7.6
Interest component of rent expense					39.4
Fixed charges				$	261.0
Ratio of earnings to fixed charges					3.1