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


	Year Ended December 31,
	2007				2006				2005				2004				2003
Earnings:	(in millions, except ratio of earnings to fixed charges)
Income before income taxes		$	1,174.1			$	824.6			$	788.3			$	596.7			$	433.8
Add:
Interest expense			285.4				285.8				199.0				138.1				124.7
Amortization of debt expense			10.6				10.3				5.2				7.2				8.0
Interest component of rent expense			55.5				53.6				40.4				26.8				24.4
Earnings		$	1,525.6			$	1,174.3			$	1,032.9			$	768.8			$	590.9
Fixed charges:
Interest expense			285.4				285.9				199.0				138.1				124.7
Amortization of debt expense			10.6				10.2				5.2				7.2				8.0
Interest component of rent expense			55.5				53.6				40.4				26.8				24.4
Fixed charges		$	351.5			$	349.7			$	244.6			$	172.1			$	157.1
Ratio of earnings to fixed charges			4.3	x			3.4	x			4.2	x			4.5	x			3.8	x