Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-84826, 333-99693 and 333-129949) and on Form S-8 (Nos. 333-59281, 333-64389, 333-78317, 333-64300, 333-103752, 333-120393, 333-123424, 333-134607, 333-144135 and 333-151964) of L-3 Communications Holdings, Inc. and subsidiaries of our report dated February 26, 2009 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

New York, New York

February 26, 2009