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, 2004
Earnings:
Income before income taxes				$	413,495
Add:
Interest expense					101,325
Amortization of debt expense					5,454
Interest component of rent expense					19,509
Earnings				$	539,783
Fixed Charges:
Interest expense					101,325
Amortization of debt expense					5,454
Interest component of rent expense					19,509
Fixed Charges				$	126,288
Ratio of earnings to fixed charges					4.3x