Tech. Sgt. Tracy Stewart verifies patient identification. U.S. Air Force Tech. Sgt. Tracy Stewart, from the 28th Medical Support Squadron, verifies patient identification on blood samples at Ellsworth Air Force Base, S.D., on Dec. 10, 2008. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 048456-F-OKT53-190.jpg Photo Gallery