Sentry, US Army Photo, Fort Irwin, California

FORT IRWIN, Calif. - A U.S. Army Soldier from 1st Battalion, 12th Infantry Regiment, pulls security during an attack during Decisive Action Rotation 16-02 at the National Training Center, Fort Irwin, Calif., Nov. 13, 2015. Decisive action rotations create a realistic training environment that tests the capabilities of Brigade Combat Teams preparing them to face similarly equipped opposing forces. (U.S. Army photo by Pfc. Dedrick Johnson, Operations Group, National Training Center)