Colonel William Marshall was commissioned an Infantry Officer upon graduation from Officer Candidate School, 18 September, 1969. His first duty assignment was as an Instructor, Tactics Committee, Fort Benning, Georgia. | His subsequent duty assignments include: Practicing Medical Officer, U.S. Army Hospital, Vicenza, Italy; Deputy Commander and Chief of Clinics for Clinical Services, Fort Irwin, California; Medical Officer and Deputy Commander for Clinical services, 129th Evacuation Hospital, San Diego, California; Commander, 6252 U.S. Army Hospital, Ventura, California; Mobilized for Operation DESERT STORM; General Medical Officer, Walson Army Hospital, Fort Dix, New Jersey; Commander, 6252, U.S. Army Hospital, Ventura, California; 63rd Regional Support Command Surgeon, Los Alamitos, California; Command Surgeon for the 63 RSC, Los Alamitos, California.