Brigadier General Darrel Porr, M.D. was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 6-70 in September 1970. His first duty assignment was as Executive Officer, 1st Special Operations Detachment, Special Forces Group, Okinawa, Japan and Republic of Vietnam. | His subsequent duty assignments include: Assistant Battalion Adjutant, Company C, 2nd Special Forces Battalion, 1st Group, Okinawa, Japan; Executive Officer, Special Forces Operations Detachment, Okinawa, Japan; Executive Officer, Company B, 2nd Special Forces Battalion, Okinawa, Japan; Assistant Adjutant, Headquarters and Headquarters Company, 1st Special Forces Group (Airborne), Okinawa, Japan; Executive Officer Rifle Company, Company B, 3rd Battalion, 60th Infantry, 9th  Infantry Division; Intern and Resident, Family Practice, Madigan Army Medical Center, Fort Lewis, Washington; Director, Family Practice Clinic, Medical Center, Fort Bragg, North Carolina; Task Force Surgeon, Special Forces Operations Detachment-Delta, Fort Bragg, North Carolina; Command Surgeon, Headquarters Joint Special Operations Command, Fort Bragg, North Carolina; Division Surgeon, 82nd Airborne Division, Fort Bragg, North Carolina; Director, Family Practice Residency, Medical Center, Fort Bragg, North Carolina; Military Medicine Consultant, Office of the Surgeon General, Pentagon, Washington District of Columbia; Chief Medical Officer, 307th Medical Battalion, 82nd Airborne Division , Saudi Arabia; Hospital Commander, 67th Combat Support Hospital, Wurzburg, Germany; Deputy Commander, Madigan Army Medical Center, Fort Lewis, Washington; Commanding General, 44th Medical Brigade, Fort Bragg, North Carolina; Commander, 44th Medical Brigade, and Corps Surgeon, XVIII Airborne Corps, Fort Bragg, North Carolina.