Assault boat during live-fire battle drills

U.S. Navy Gunner's Mate 3rd Class Geoffrey Martin, assigned to Riverine Squadron 1, fires a GAU-17A gun system from the bow of a riverine assault boat during live-fire battle drills at Fort Knox, Ky., March 28, 2010. Sailors with the squadron are participating in a three-day field exercise to prepare for an upcoming deployment. (DoD photo by Mass Communication Specialist 3rd Class Bryan Weyers, U.S. Navy/Released)