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

Exhibit 12

				L-3
				Year Ended December 31,
				2003				2002				2001				2000				1999
Earnings:
Income before income taxes and cumulative effect of a change in accounting principle				$	433,813			$	314,023			$	186,222			$	134,079			$	95,430
Add:
Interest expense					124,706				115,100				80,002				87,308				56,686
Amortization of debt expense					7,977				7,392				6,388				5,724				3,904
Interest component of rent expense					24,364				22,342				14,332				11,882				7,500
Earnings				$	590,860			$	458,857			$	286,944			$	238,993			$	163,520
Fixed charges:
Interest expense					124,706				115,100				80,002				87,308				56,686
Amortization of debt expense					7,977				7,392				6,388				5,724				3,904
Interest component of rent expense					24,364				22,342				14,332				11,882				7,500
Fixed charges				$	157,047			$	144,834			$	100,722			$	104,914			$	68,090
Ratio of earnings to fixed charges					3.8	x			3.2	x			2.8	x			2.3	x			2.4	x