U.S. Marines with 3rd Assault Amphibious Battalion, Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms, and 1st Battalion, 4th Marine Regiment, Camp Pendleton, Calif., watch as a hillside is barraged with artillery on Feb. 10, 2015, during Integrated Training Exercise 2-15 at MCAGCC. MCAGCC conducts relevant live-fire combined arms training, urban operations, and Joint/Coalition level integration training that promotes operational forces readiness. (U.S. Air Force photo by Technical Sgt. Daniel St. Pierre/Released)