Exhibit 12.1

L-3 COMMUNICATIONS HOLDINGS, INC. AND
L-3 COMMUNICATIONS CORPORATION

RATIO OF EARNINGS TO FIXED CHARGES

(Dollars in thousands)

				Nine Months Ended September 30, 2005
Earnings:
Income before income taxes				$	552,555
Add:
Interest expense					131,396
Amortization of debt expense					5,150
Interest component of rent expense					27,328
Earnings				$	716,429
Fixed Charges:
Interest expense				$	131,396
Amortization of debt expense					5,150
Interest component of rent expense					27,328
Fixed Charges				$	163,874
Ratio of earnings to fixed charges					4.4x