Table of Contents

Exhibit 12

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

			Six Months Ended June 30, 2006
			(dollars in millions)
Earnings:
Income before income taxes				$	295.1
Add:
Interest expense					139.7
Amortization of debt expense					5.1
Interest component of rent expense					25.6
Earnings				$	465.5
Fixed charges:
Interest expense					139.7
Amortization of debt expense					5.1
Interest component of rent expense					25.6
Fixed charges				$	170.4
Ratio of earnings to fixed charges					2.7