Exhibit 12.1

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

RATIO OF EARNINGS TO FIXED CHARGES

(Dollars in thousands)

				Three Months Ended March 31, 2005
Earnings:
Income before income taxes					160,576
Add:
Interest expense					36,585
Amortization of debt expense					1,525
Interest component of rent expense					8,043
Earnings					206,729
Fixed Charges:
Interest expense					36,585
Amortization of debt expense					1,525
Interest component of rent expense					8,043
Fixed Charges					46,153
Ratio of earnings to fixed charges					4.5	x