It was converted into a signal aircraft warning regiment after the United States entered World War II.

Shortly after the United States entered World War I, the regiment was constituted in the National Army on 18 May 1917, and organized in separate elements in early 1918.

[3] The regiment's 3rd Squadron usually held its inactive training period meetings at the Kitteridge Building or the Argonaut Hotel in Denver.

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

The distinctive unit insignia included a 1 1/8 in (2.86 cm) gold colored metal and enamel device, which consisted of a yellow shield with red borders.

The shield was divided by a diagonal green stripe and in its center was an American Indian on horseback brandishing a carbine.

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.