Syringe Preparation Air Force Capt. Michael Burnett, a physician assistant assigned to the 75th Operation Medical Readiness Squadron, Hill Air Force Base, prepares a syringe for a patient at Yuma Regional Medical Center in Yuma, Ariz., Feb. 24, 2022. SHARE: Download: Full Size (0.75 MB) Tags: Air Force, Coronavirus, covid19vaccine Credit: Army Sgt. Froylan Grimaldo VIRIN: 220224-A-WB694-672.JPG Photo Gallery