U.S. Navy Petty Officer 2nd Class Andrew Thayer mans an M2HB .50-caliber machine gun aboard the guided-missile destroyer USS Gridley in the U.S. 5th Fleet area of operations, Jan. 31, 2015. Thayer is a fire controlman. U.S. Navy Petty Officer 2nd Class Andrew Thayer mans an M2HB .50-caliber machine gun aboard the guided-missile destroyer USS Gridley in the U.S. 5th Fleet area of operations, Jan. 31, 2015. Thayer is a fire controlman. SHARE: Download: Full Size (2.25 MB) Tags: photo essays Credit: VIRIN: 741079-E-YSJ42-983.jpg Photo Gallery