First Lt. Dillen Stuhlsatz, 34th Bomb Squadron weapons systems officer, donates blood in the Deployment Center sterile room at Ellsworth Air Force Base, S.D., Jan. 22, 2016. Blood donation is a simple four-step process: registration, medical history and mini-physical, donation and refreshments, and provides live-saving blood for patients in the area. A simple pint of blood can potentially save three lives. (U.S. Air Force photo by Airman Donald C. Knechtel/Released)