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, 2005
Earnings:
Income before income taxes				$	347,670
Add:
Interest expense					73,794
Amortization of debt expense					2,818
Interest component of rent expense					16,127
Earnings				$	440,409
Fixed Charges:
Interest expense				$	73,794
Amortization of debt expense					2,818
Interest component of rent expense					16,127
Fixed Charges				$	92,739
Ratio of earnings to fixed charges					4.7x