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PMS401 Submarine Acoustic Systems (U.S. Navy) Black Coffee Mug Size:15oz as well as individuals connectedPMS401 Submarine Acoustic Systems (U. S. Navy) PMS401, or the U. S. Navy's Program Manager for Submarine Acoustic Systems, is a crucial department responsible for the design, development, installation, and maintenance of the underwater acoustic systems used in the United States Navy's submarines. These systems include sonar and communication equipment, as well as anti sonar countermeasures, essential for navigation, detecting and avoiding threats, and