U.S. Air Force Airman 1st Class William Sales, an aerospace medical technician from the New Jersey Air National Guard's 177th Medical Group, demonstrates proper immunization techniques at the 86th Medical Clinic on Ramstein Air Base, Germany, Aug. 6. Sales is in the process of completing his immunization back-up technician training at the clinic. (U.S. Air National Guard photo by Senior Airman Shane S. Karp/Released)