Senior Master Sgt. Jim Haupt, superintendent of aircrew flight equipment assigned to the 910th Operations Support Squadron, checks the fitting of an aircrew eye respiratory protection system of Master Sgt. Rich Lawton, an instructor flight engineer 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)