Brigadier General John A. York was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 7, 19 July 1947. His first duty assignment was as a Rifle Platoon Leader, 23d Infantry, 2d Infantry Division, Fort Lewis, Washington. | His subsequent duty assignments include: Unit Training Officer, 4th Infantry Division (Training), Fort Ord, California; Executive Officer, Heavy Weapons Company, Fort Lewis, Washington; Platoon Leader, 415th Infantry Regiment, 104th Infantry Division, Tacoma, Washington; Assistant Instructor, U of Washington ROTC, Seattle, Washington; Company Commander, Heavy Mortar (4.2), Company, 70th Infantry Division, Fort Wayne, Indiana; S-4, 414th Transportation Battalion, Erie, Pennsylvania; Detachment Commander, 897th Ord Detachment (Explosive Disposal), Tacoma, Washington; G-3, Washington State Guard, Camp Muray, Washington; Chief of Staff, Washington State Guard, Camp Murray, Washington; Deputy Commander, Washington State Guard, Camp Murray, Washington; Commanding General, Washington, State Guard, Camp Murray, Washington.