U.S. Air Force Staff Sgt. Duncan, 332d Expeditionary Medical Group medical technician, performs a blood typing test at the 332d Air Expeditionary Wing, Dec. 20, 2019. The 332 EMDG started the first walking blood bank for military members to provide blood in case of an emergency medical care incident. (U.S. Air Force photo by Tech. Sgt. Andrew Satran)