Colonel David P. Lehman was commissioned an Infantry Officer upon graduation from Officer Candidate School 21 December 1942. His first duty assignment was as Platoon Leader, Company A, 111th Infantry, Fort Monroe, Virginia. | His subsequent duty assignments include: Motor Maintenance Officer, 1st Battalion, 111th Infantry Regiment, Pacific Ocean Area; Adjutant, 1st Battalion, 111th Infantry, Pacific Ocean Area; Intern, Ireland Army Hospital, Fort Knox, Kentucky; Commander 337th, General Hospital, Fort Harrison, Indiana; Commander, 6251st U.S. Army Hospital, Phoenix, Arizona;  Commander, 403d Combat Support Hospital, Phoenix, Arizona.