LIGHTWEIGHT GUN The guided-missile destroyer USS Stout fires its Mk-45 5-inch lightweight gun during a live-fire exercise in the Mediterranean Sea, Jan. 27, 2014. The Stout is supporting maritime security operations and theater security cooperation efforts in the U.S. 6th Fleet area of responsibility. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 071000-K-FHT63-669.jpg Photo Gallery