Exhibit 12.1

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

RATIO OF EARNINGS TO FIXED CHARGES

(Dollars in thousands)

				Six Months Ended June 30, 2004
Earnings:
Income before income taxes				$	252,093
Add:
Interest expense					68,309
Amortization of debt expense					3,616
Interest component of rent expense					13,540
Earnings				$	337,558
Fixed Charges:
Interest expense					68,309
Amortization of debt expense					3,616
Interest component of rent expense					13,540
Fixed Charges				$	85,465
Ratio of earnings to fixed charges					3.9x