It was transferred on 3 September 1921 to St. Albans, West Virginia, to perform riot control during a coal miner’s strike in Logan County.

It was inactivated on 1 November 1921 at Danville, West Virginia, and allotted to the Third Corps Area; the 20th Infantry Regiment had been previously designated as Active Associate on 27 July 1921, which would provide the cadre to reactivate the 40th Infantry in the event of war.

Organized 26 March 1926 with Organized Reserve personnel as a "Regular Army Inactive" (RAI) unit with headquarters at the U.S. Veterans Bureau building in Washington, D.C. Inactivated by relief of Reserve personnel on 24 November 1926.

Affiliated with the Cornell University ROTC program on 18 April 1930 and organized at Ithaca as an RAI unit with Regular Army personnel assigned to the ROTC detachment and Reserve officers commissioned from the program.

[2] A Gold color metal and enamel device 1+1⁄4 inches (3.2 cm) in height consisting of a shield blazoned: Azure, the head of a wolverine erased Or; on a canton Argent a six-bastioned fort Vert charged with a mullet of the third (for the 36th Infantry).