Forward Advance Marines conduct a simulated assault on an objective at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 13, 2019, during Steel Knight, an annual exercise that tests Marines and sailors across a range of environments. SHARE: Download: Full Size (0.82 MB) Tags: Marine Corps, Training Credit: Marine Corps Sgt. Miguel Rosales VIRIN: 191208-M-WQ429-1207C.JPG Photo Gallery