U.S. Air Force Tech Sgt. Stephanie Williams, 633d Surgical Squadron diagnostic imaging technologist, punctures a mannequin during Tactical Combat Casualty Care Tier Two Training at Joint Base Langley-Eustis, Virginia, April 29, 2025. Simulating tension pneumothorax, Williams allowed air to circulate from the heart of the mannequin by releasing the built-up tension in its chest. (U.S. Air Force photo by Airman 1st Class Donnell Ramsey)