MORTAR FIRE U.S. Marines fire an M120 mortar system during Exercise Iron Fist 2014 on Camp Pendleton, Calif., Feb. 3, 2014. The amphibious exercise brings together U.S. Marines and sailors and Japan Ground Self-Defense Force soldiers to promote military interoperability through challenging, complex and realistic training. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 609212-Z-XNL39-406.jpg Photo Gallery