U.S. Marines provide security while participating in a ground air integration training event during Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Jan. 26, 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)