Colonel Arlen R. Suddaby was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 9A, 27 May 1949. His first duty assignment was as Platoon Leader, Company C, 29th Infantry Regiment, Okinawa, Japan. | His subsequent duty assignments include: Platoon Leader, Company K, 35th Infantry Regiment, Korea; Commanding Officer, Company E, 39th Infantry Regiment, Fort Dix, New Jersey; Infantry Unit Commander (Advisor), Chinese Infantry School, Formosa; Infantry Advisor, Michigan National Guard, Port Huron, Michigan; Commanding Officer, 2nd Division Aviation Company, Fort Benning, Georgia; Chief Plans Division, Headquarters, Eighth Army, Korea; Chief Employment Division, USA Aviation School, Fort Rucker, Alabama; Operations Officer, J-3 U.S. European Command, Germany; Battalion Commander, 101st Airborne Division Aviation Battalion, Vietnam; Chief Operations Division, Headquarters, U.S. Army, Vietnam; and Chief Operations Division, J-1, Headquarters CINCPAC, Hawaii.