Observer coach/trainers assigned to the 157th Infantry Brigade, First Army Division East, observe 38th Infantry Division Soldiers updating the common operating picture during a command post exercise at Fort Campbell, Ky., Mar. 19, 2022. First Army OC/Ts observed every stage of the training to provide doctrinal advice and feedback during the exercise and final after action review. (U.S. Army photo by Sgt. James Hobbs)