Most of the division returned to New York in September 1945, and from there went to Camp Bowie, Texas. On 7 December 1945, the division was inactivated from the active duty force and its members reassigned to other Army units. The following year, on 10 September 1946, the 45th Infantry Division was reconstituted as a National Guard unit. Instead of comprising units from several states, the post-war 45th was an all-Oklahoma organization. During this time the division was also reorganized and as a part of this process the 157th Infantry was removed from the division's order of battle and replaced with the 279th Infantry Regiment.