The group is responsible for maintaining and operating on alert the wing's assigned LGM-30G Minuteman III intercontinental ballistic missiles.

The group was activated in July 1947 at Andrews Field, Maryland by Strategic Air Command (SAC), but appears not to have been manned before inactivating in September 1948.

It was again activated by SAC at Fairchild Air Force Base in January 1951 and began equipping with Boeing B-29 Superfortress bombers, but a reorganization the following month reduced the group to paper status until it again inactivated in June 1952.

[5] The group attacked enemy airfields, troop concentrations, ground installations and shipping in New Guinea, the Bismarck Archipelago, Palau and the southern Philippines.

[5] During 1944, the 90th supported the New Guinea Campaign through the end of June, then made long-range raids on oil refineries at Balikpapan, Borneo, in September and October.

In January 1945, the group moved to the Philippines and supported ground forces on Luzon, attacked industrial targets on Formosa, and bombed railways, airfields, and harbor facilities on the Asiatic mainland.

[5] After VJ Day, the group flew reconnaissance missions over Japan and ferried Allied prisoners of war from Okinawa to Manila.

[2][10][11] The group was again activated at Fairchild Air Force Base, Washington in January 1951 and was assigned to the 90th Bombardment Wing under the wing/base organization system.

[12] However, as SAC mobilized for the Korean War it found that its wing commanders focused too much on running the base organization and were not spending enough time on overseeing combat preparations.