Staff Sgt. Johanna Esquivel, 2nd Operational Medical Readiness Squadron medical technician, takes a test during a Tactical Combat Casualty Care class at Barksdale Air Force Base, La., Dec. 7, 2020. Barksdale medics must take a three day course to be trained on the new TCCC guidelines. (U.S. Air Force photo by Airman 1st Class Jacob B. Wrightsman)