Airman 1st Class Amber App verifies patient identifications on blood samples. U.S. Air Force Airman 1st Class Amber App, a 28th Medical Support Squadron laboratory apprentice, verifies patient identifications on blood samples at Ellsworth Air Force Base, S.D., on Oct. 15, 2009. The blood App verifies will be separated and the remaining blood sent on for further analysis. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 330429-C-DPE60-856.jpg Photo Gallery