323rd Cavalry Regiment was a cavalry unit of the United States Army during the interwar period . The unit was activated as a California , Washington , and Oregon Organized Reserve unit during the interwar period , although it was later relocated entirely to California . It was converted into a signal aircraft warning regiment after the United States entered World War II . The regiment was constituted on 15 October 1921 in the Organized Reserves , part of the 66th Cavalry Division 's 162nd Cavalry Brigade in the Seventh Corps Area . On 14 November it was transferred to the Ninth Corps Area . It was initiated ( activated ) on 4 March 1922 with headquarters at San Francisco , 1st Squadron at Sacramento , and 2nd Squadron at Portland with two troops in Washington . In 1924 , the headquarters was relocated to San Diego , the Oregon and Washington units were inactivated , and the 1st and 2nd Squadrons moved to Los Angeles . In July 1929 , the 323rd was reorganized as a three-squadron regiment . On 28 January 1930 , the entire regiment was relocated to San Diego . Between 14 and 22 March 1933 , many unit personnel participated in relief operations in response to the 1933 Long Beach earthquake . In 1934 , the entire regiment was relocated to Los Angeles
1933 Long Beach earthquake
1933 Long Beach earthquake
323rd Cavalry Regiment (United States)