[8] On June 18, 1920 the regiment was reorganized and redesignated as the 9th Coast Defense Command, New York National Guard.

On December 21, 1941 1st Battalion moved to Fort Macon, North Carolina where established the Temporary Harbor Defenses of Beaufort, NC.

This unit landed in France on June 16, 1944 and served in the European theater until returned to New York and inactivated October 6, 1945.

[4][9] On December 24, 1941 2nd Battalion moved to Fort Lewis, Washington where staged for deployment to Alaska via Seattle POE.

This unit was further redesignated as the 782nd Chemical Mortar Battalion on July 5, 1945 at Camp Bowie, Texas and inactivated there on September 8, 1945.