Table of Contents

Exhibit 12

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

				Three Months Ended March 31, 2006
				(dollars in millions)
Earnings:
Income before income taxes				$	220.1
Add:
Interest expense					69.4
Amortization of debt expense					2.5
Interest component of rent expense					12.3
Earnings				$	304.3
Fixed charges:
Interest expense					69.4
Amortization of debt expense					2.5
Interest component of rent expense					12.3
Fixed charges				$	84.2
Ratio of earnings to fixed charges					3.6	x