TAKING COVER Marine Corps Cpl. Colton Derick lays down for cover during a simulated enemy explosion during an integrated training exercise on Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 13, 2015. Derick is a rifleman assigned to the 4th Marine Division's Bravo Company, 1st Battalion, 23rd Marine Regiment, Marine Forces Reserve. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 384631-N-HIH00-706.jpg Photo Gallery