Trip Wire Marine Corps Sgt. Esteban Keel sets up a trip wire attached to a flare during a Marine Corps Combat Readiness Evaluation at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., July 8, 2017. Keel is a rifleman assigned to the 1st Marine Division’s 2nd Battalion, 7th Marine Regiment. Marine Corps photo by Cpl. Justin Huffty SHARE: Download: Full Size (1.62 MB) Tags: Marines, Northcom, Northern Command, training, Marine Corps Credit: Cpl. Justin Huffty VIRIN: 170708-M-XK350-040A.JPG Photo Gallery