FIRE EXERCISE U.S. Marine Corps 1st Sgt. Michael P. Edwards pulls the lanyard on a 120-mm mortar system, causing it to fire during a training exercise on Camp Pendleton, Calif., June 21, 2011. Edwards is assigned to Kilo Battery, 3rd Battalion, 12th Marine Regiment. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 038736-C-ULO88-509.jpg Photo Gallery