U.S. Army Soldiers of the 1st Battalion, 43rd Air Defense Artillery (ADA) regiment, 11th ADA Brigade, observe Chemical, Biological, Radiological, Nuclear, and high yield explosives (CBRNE) decontamination techniques during a ground survey as part of a joint decontamination exercise Feb. 22, 2019, at Al Udeid Air Base, Qatar. U.S. Air Force and Army participants from the 379th Expeditionary Civil Engineer Squadron and the 1-43rd ADA, shared CBRNE best practices, and tested their response proficiency during the training. The event was the conclusion of a four phase training curriculum. (U.S. Air Force photo by Tech. Sgt. Christopher Hubenthal)