Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-144135, 333-151964 and 333-160359) of L-3 Communications Holdings, Inc. and subsidiaries and in the Registration Statements on Form S-3 ASR (No. 333-165756) of L-3 Communications Corporation and subsidiaries of our report dated February 24, 2011 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 24, 2011