Seaman Apprentice Sean Costello loads a .50-caliber machine gun. Navy Seaman Apprentice Sean Costello loads a .50-caliber machine gun aboard a riverine assault craft at Camp Lejeune, N.C., on Sept. 8, 2006. U.S. Navy sailors with Riverine Group One are conducting high-speed, small unit riverine craft training in the Cape Fear River in North Carolina. SHARE: Download: Full Size (0.13 MB) Tags: military services, news photos, other subjects, lead photos, dod organizations, navy Credit: VIRIN: 456597-C-DYZ61-034.jpg Photo Gallery