Colonel John F. Armstrong was commissioned a Medical Service Corps Officer upon graduation from Officer Candidate School, Class 1-73, 16 January 1973. His first duty assignment was as a Platoon Leader, Company D, 48th Medical Battalion, 2d Armored Division, Fort Hood, Texas. | His subsequent duty assignments include: Commander, Company D, 48th Medical Battalion, 2d Armored Division, Fort Hood, Texas; Commander, Medical Company, 498th Support Battalion, Grafenwohr, Germany; Adjutant/Administrator, 97th General Hospital, Frankfurt, Germany; Instructor, U.S. Army Medical Department Center and School, Fort Sam Houston, Texas; Chief, Patient Affairs Branch, Office of the Surgeon General, Washington, D.C.; Director, Benefits Policy Division, Assistant Secretary of Defense (Health Affairs), Washington, D.C.; Patient Administration Consultant, 18th Medical Command, Seoul, Korea; Commander, 85th Medical Battalion, Fort Meade, Maryland; Chief, Plans, Training, Mobilization, & Security and Executive Officer, Eisenhower Army Medical Center, Fort Gordon, Georgia; Deputy Assistant Program Manager (Health Affairs), Saudi Arabian National Guard Modernization Program, Riyadh, Saudi Arabia; Deputy Command Surgeon, U.S. Central Command, MacDill Air Force Base, Florida.