A 1st Brigade Combat Team, 101st Airborne Division (Air Assault) Soldier dons his protective mask while being evaluated during the testing phase of the Expert Field Medical Badge challenge here, Aug. 5, 2015. Chemical, biological, radiological, and nuclear testing is one of the many warrior tasks and drills the medics were evaluated on. (U.S. Army photo by Staff Sgt. Sierra A. Fown, 2nd Brigade Combat Team, 101st Airborne Division Public Affairs)