Exhibit 12

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

			Six Months Ended June 30, 2007
			($ in millions, except ratio of earnings to fixed charges)
Earnings:
Income before income taxes				$	542.2
Add:
Interest expense					141.4
Amortization of debt expense					5.2
Interest component of rent expense					27.0
Earnings				$	715.8
Fixed charges:
Interest expense					141.4
Amortization of debt expense					5.2
Interest component of rent expense					27.0
Fixed charges				$	173.6
Ratio of earnings to fixed charges					4.1	x