U.S. Army Master Sgt. Timothy Brogan (rear), an Observer,

U.S. Army Master Sgt. Timothy Brogan (rear), an Observer, Coach/Trainer (OT/C), watches how Soldiers respond to a simulated chemical agent attack while standing behind Staff Sgt. Michael Burch, Company C, 1st Battalion, 63rd Armor Regiment, as he calls in a nine-line medical evacuation during at Joint Warfighting Assessment (JWA) 18, Hohenfels, Germany, May 3, 2018. OT/Cs are responsible for closely watching and evaluating training scenarios, making sure it is completed to mission and safety standards. (U.S. Army photo by Staff Sgt. Shaiyla Hakeem)