 After his election to the U.S. Senate, Truman was transferred to the General Assignments Group, a holding unit for less active officers; he had not been consulted or notified in advance. Truman protested his reassignment, which led to his resumption of regimental command. He remained an active reservist until the early 1940s. Truman volunteered for active military service during World War II, but was not accepted, partly because of age, and partly because President Franklin D. Roosevelt desired Senators and Congressman who belonged to the military reserves to support the war effort by remaining in Congress, or by ending their active duty service and resuming their Congressional seats. He was an inactive reservist from the early 1940s until retiring on January 20, 1953.
