Petty Officer 3rd Class Nicole Blair repairs a jammed .50-caliber machine gun. U.S. Navy Petty Officer 3rd Class Nicole Blair repairs a jammed .50-caliber machine gun during a security training exercise aboard the aircraft carrier USS Harry S. Truman (CVN 75) underway in the Atlantic Ocean on Aug. 8, 2009. The ship is conducting carrier qualifications. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 976390-D-LLX19-303.jpg Photo Gallery