U.S. Air Force Staff Sgt. Tanner Merchen, 633d Medical Support Squadron laboratory technician, left, and Staff Sgt. Miguel Guajardo, 633d Dental Squadron dental assistant, right, apply tourniquets to themselves during Tactical Combat Casualty Care Tier Two Training at Joint Base Langley-Eustis, Virginia, April 28, 2025. Instructors simulated a sudden attack and tested Airmen’s ability to apply a tourniquet on themselves within 30 seconds. (U.S. Air Force photo by Airman 1st Class Donnell Ramsey)