Shortly after the United States entered World War I, the regiment was constituted in the National Army on 18 May 1917, and organized on 15 February 1918 at Fort Riley.

Headquarters and 1st Squadron also conducted regular equestrian training on the Peacock Military Academy's horses and often participated in San Antonio's annual Army Day parade.

Several regimental officers observed the 7th Cavalry Brigade in the September 1939 annual Fifth Corps Area maneuver at Fort Knox.

The regiment was disbanded on 18 October 1943,[1][2] after its personnel were called up for active duty during the military buildup prior to the American entry into World War II.

[5] An unrelated reserve unit, the 311th Armored Cavalry Regiment, briefly existed after the war in Texas and Louisiana.

The regimental coat of arms was of a similar design to the distinctive unit insignia but included the Organized Reserve's Minuteman crest above the shield and omitted the motto.