TWIN FIRE Navy Petty Officer 2nd Class Justin Butts fires twin .50 caliber machine guns during a live-fire training exercise on the amphibious assault ship USS Boxer in the Pacific Ocean, March 26, 2013. Boxer is under way conducting training off the coast of Southern California. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 931771-I-DMY29-277.jpg Photo Gallery