Vigilant Ace 18
Staff Sgt. Terrance Macklin, 374th Operations Support Squadron aircrew flight equipment craftsman, performs an inspection on aircrew chemical, biological, radiological and nuclear protective gear during exercise Vigilant Ace 18, Dec. 6, 2017, at Yokota Air Base, Japan. The exercise included CBRN training for aircrew during flight to ensure in-flight mission readiness. (U.S. Air Force photo by Senior Airman Donald Hudson)