Colton Derick, a rifleman with Company B, 1st Battalion, 23rd Marine Regiment, 4th Marine Division, Marine Forces Reserve, lays down for cover during a simulated enemy explosion during the live fire company attacks during the Integrated Training Exercise 4-15 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 13, 2015. The unique terrain and weather conditions at the range combined with the exercise simulation provide the most realistic experience of what they would go through during a deployment to the Middle East. (U.S Marine Corps photo by Cpl. Ian Ferro)