Staff Sgt. Carl Doan, 628th Medical Group diagnostic imaging craftsman, practices administering an X-ray to Staff Sgt. John Bartlett, 628th MDG medical technician, Feb. 27, 2013 at Joint Base Charleston – Air Base, S.C. Doan is focusing on the cervical vertebrae, or c-spine, which is located in the upper body and is typical of neck injuries. (U.S. Air Force photo/Airman 1st Class Tom Brading)