U.S. Marines conduct operations while participating in a combined arms simulation trainer event during Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center, Twentynine Palms (MCAGCC), Calif., Jan. 29, 2015. 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 Airman 1st Class Matthew L. Garcia/Released)