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 IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 931771-I-DMY29-277.jpg Photo Gallery