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AN/BLQ-10, also known as the Submarine Electronic Warfare Support System, is a United States Navy submarine electronic support measures (ESW) system built and maintained by Lockheed Martin Corporation's Rotary and Mission Systems division. The system provides detection, classification, localization, and identification of radar and communications signals in the vicinity of the submarine. A singular system comprised of several subsystems, it performs both signals intelligence gathering and processing when a submarine is at periscope depth. The system entered the Engineering & Manufacturing Development (EMD) Phase in the acquisitions process in October 1994.