U.S. Air Force Staff Sgt. Christopher Leonard, a paramedic assigned to the 633rd Medical Operations Squadron, inserts a needle into the arm of Airman 1st Class Lindsey Schmalfeldt, an aerospace medical technician assigned to the 633rd MDOS, during training at Langley Air Force Base, Va., March 7, 2016. Properly inserting intravenous therapy is part of the foundation that aerospace medical trainees are expected to learn before they report to their next duty station. (U.S. Air Force photo by Senior Airman Brittany E. N. Murphy)