FORT KNOX, Ky. (March 29, 2010) Gunner's Mate 3rd Class Geoffrey Martin, assigned to Riverine Squadron (RIVRON) 1, fires a GAU-17A gun from the bow of a riverine assault boat during live-fire battle drills. The squadron is participating in a three-day field exercise to prepare for an upcoming deployment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Bryan Weyers/Released)
