Exhibit 12

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

				Year Ended December 31,
				2005				2004				2003				2002				2001
Earnings:				(in millions, except ratio of earnings to fixed charges)
Income before income taxes and cumulative effect of a change in accounting principle				$	788.3			$	596.7			$	433.8			$	314.0			$	186.2
Add:
Interest expense					199.0				138.1				124.7				115.1				80.0
Amortization of debt expense					5.2				7.2				8.0				7.4				6.4
Interest component of rent expense					40.4				26.8				24.4				22.4				14.3
Earnings					1,032.9				768.8			$	590.9			$	458.9			$	286.9
Fixed charges:
Interest expense					199.0				138.1				124.7				115.1				80.0
Amortization of debt expense					5.2				7.2				8.0				7.4				6.4
Interest component of rent expense					40.4				26.8				24.4				22.4				14.3
Fixed charges				$	244.6			$	172.1			$	157.1			$	144.9			$	100.7
Ratio of earnings to fixed charges					4.2	x			4.5	x			3.8	x			3.2	x			2.8	x