Table of Contents

Exhibit 12

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

			Year Ended December 31,
			2006						2005						2004						2003						2002
Earnings:			(in millions, except ratio of earnings to fixed charges)
Income before income taxes and cumulative effect of a change in accounting principle				$	824.6					$	788.3					$	596.7					$	433.8					$	314.0
Add:
Interest expense					285.9						199.0						138.1						124.7						115.1
Amortization of debt expense					10.2						5.2						7.2						8.0						7.4
Interest component of rent expense					53.6						40.4						26.8						24.4						22.4
Earnings					1,174.3						1,032.9						768.8					$	590.9					$	458.9
Fixed charges:
Interest expense					285.9						199.0						138.1						124.7						115.1
Amortization of debt expense					10.2						5.2						7.2						8.0						7.4
Interest component of rent expense					53.6						40.4						26.8						24.4						22.4
Fixed charges				$	349.7					$	244.6					$	172.1					$	157.1					$	144.9
Ratio of earnings to fixed charges					3.4	x					4.2	x					4.5	x					3.8	x					3.2	x