Smoky Support Marines fire an M777 howitzer high-explosive round during an integrated training exercise at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., July 30, 2017. The exercise creates a challenging, realistic training environment that produces combat-ready forces. Marine Corps photo by Cpl. Justin M. Smith SHARE: Download: Full Size (1.32 MB) Credit: Cpl. Justin Smith VIRIN: 170730-M-ZP794-1226C.JPG Photo Gallery