SHAW AIR FORCE BASE, S.C. -- U.S. Air Force Chief Master Sgt. Christopher Griste, 20th Fighter Wing command chief, visits the 20th Medical Group for an immersion tour at Shaw Air Force Base, South Carolina, April 6, 2026. Griste met with emergency medical services experts to get a first-hand look at the emergency training, life-saving equipment, and day-to-day operations carried out by emergency medical services. (U.S. Air Force photos by Airman Will Sherwood)