Colonel Dean Allen Youngman was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 9-70, 17 April 1970. His first duty assignment was as Executive Officer, Special Forces Operational Detachment A-1, 8th Special Forces Group (SFG) (Airborne), Fort Gulik, Canal Zone, Panama. | His subsequent duty assignments include: Assistant S-3 Advisor/Acting District Senior Advisor, Republic of Vietnam; Executive Officer, C Company, 2-327 Infantry, 101st Airborne Division, Fort Campbell, Kentucky; Counterintelligence Officer/Operations Office, 389th Military Intelligence Detachment (Special Action Force) (Airborne), Louisville, Kentucky; Commander, Troop A, 240th Cavalry, 149th Separate Armored Brigade, Owensboro, Kentucky; Chief, Plans, Production and Dissemination Branch, 1st Special Operations Command (Airborne)(Provisional), Fort Bragg, North Carolina; Commander, 2d Battalion, 123d Armor, 35th Infantry Division (Mechanized), Bowling Green, Kentucky; Chief, Unit Training Branch, National Guard Bureau, Washington, D.C.; Chief, Research & Staff Support Office, Office of the Director, Army National Guard, Washington, D.C.; Commander, 149th Brigade, 35th Infantry Division (Mechanized), Louisville, Kentucky. | Colonel Youngman was detailed to the staff of the National Defense Panel, Washington, D.C. at the time of his induction.