Colonel William R. Gill was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 208-A, 31 March 1943. His first duty assignment was as Platoon Leader, A Company, 389th Infantry Regiment, 98th Infantry Division, Camp Breckinridge, Kentucky. | His subsequent duty assignments include: Platoon Leader and  Executive Officer, A Company, 389th Infantry Regiment, 98th Infantry Division, U.S., Central Pacific, and Japan; Investigations Officer, Legal Section, General Headquarters, Supreme Commander for the Allied Powers, Tokyo, Japan; member, U.S. Army Reserve Corps, Control Group (Active Group), Fort De Russy, Honolulu, Hawaii; member, U.S. Army Reserve, 1514th Station Complement Augmented (Training), Ithaca, New York; Investigation Officer, Headquarters, 9th Infantry Division, Fort Dix, New Jersey; Materials Engineer (Soils), Far East Command, Okinawa Engineer District, Ryuku Islands; member, U.S. Army Reserve, 1073d Control Group, Ithaca, New York; member, U.S. Army Reserve, 3178th Composite Augmented (Reinforced) Group, Opelika, Alabama; Instructor, Birmingham U.S. Army Reserve School, Montgomery, Alabama; member, U.S. Army Reserve Control Group (Reinforced), Reserve Components Personnel and Administration Center, St. Louis, Missouri. | Colonel Gill served as an Adjunct Professor of Agricultural Engineering at Auburn University, Alabama, and as a member of the Graduate Faculty at Auburn.