 In 1939 the Fifth Regiment, in anticipation of its induction into the active Army, began to prepare, using its annual training to prepare for combat.On 31 December 1940, the Army re-designated the Fifth Regiment as the 175th Infantry Regiment to avoid confusion with the Regular Army's 5th Infantry Regiment and designated as one of three infantry regiments of the 29th Infantry Division.In January 1941, the regiment was federalized.