Master Sgt. Phil Walsh, aircrew flight equipment supervisor assigned to the 910th Operations Support Squadron, debriefs aircrew members assigned to the 757th Airlift Squadron on May 4, 2019. The aircrew members here took part in an aircrew chemical, biological, radiological, nuclear defense training to practice operating in a chemical threat area. (U.S. Air Force photo/Senior Airman Juliet Louden)