In the Shadows A Marine clears a building during a squad-level urban assault as part of Service Level Training Exercise 4-26 at Marine Corps Air Ground Combat Center in Twentynine Palms, Calif., Aug. 29, 2026. The training exercise was designed to produce combat-ready forces. SHARE: Download: Full Size (1.37 MB) Tags: exercises, training, marine corps Credit: Marine Corps Sgt. Vincent Needham VIRIN: 260829-M-XY116-9086.JPG Photo Gallery