Its last assignment as a regular unit was to the 320th Bombardment Wing at Mather Air Force Base, California, where it was inactivated on 30 September 1989.

After V-E Day, the squadron remained in Germany to participate in the disarmament of the Luftwaffe, then returned to the United States for inactivation.

[1][4][5] The squadron trained rapidly in Florida, completing Phase I (individual) Operational Training at MacDill and Phase II (aircrew) Operational Training at Drane Field until beginning to move its aircraft to England in August without starting Phase III (unit) training.l[6] The air echelon departed for Baer Field, Indiana on 19 August with initial plans calling for the squadron's air echelon to move to Europe via the North Atlantic Ferrying Route.

[4] The squadron and its aircraft arrived at its first true overseas station, Oran Es Sénia Airport, Algeria, in early January 1943.

bridges airfields, road junctions, viaducts, harbors, fuel and supply dumps, defense positions and other targets in Italy.

It supported Operation Avalanche, the landings near Salerno, on the Italian mainland, and knocked out targets to aid the seizure of Naples and to cross the Volturno River.

[1][4] In November 1943, the squadron moved to Decimomannu Airfield on Sardinia[1] to be better positioned to attack targets in central and northern Italy.

It bombed bridges, railroads, gun positions, barracks, supply and munitions dumps and other targets in France and Germany unitl V-E Day.

Near the end of the war, on 15 March 1945, the squadron bombed pillboxes, weapons pits, trenches and roads within the Siegfried Line to enable the breakthrough of the United States Seventh Army, for which it was awarded a second DUC.

[12] The 441st was inactivated when Continental Air Command reorganized its reserve units under the wing base organization system in June 1949.

[1] In December, the squadron began training the cadre of B-47 aircrews for the 96th Bombardment Wing, which had been activated at Altus Air Force Base with only minimum manning as that station was being reopened.

[14][15] In June 1954, the squadron, along with the entire 320th Wing, deployed as a unit to RAF Brize Norton remaining there until September.

This was designed to meet General Thomas S. Power's initial goal of maintaining one third of SAC's planes on fifteen minute ground alert, fully fueled and ready for combat to reduce vulnerability to a Soviet missile strike.

[18][19] However, SAC was relying on the longer range Boeing B-52 Stratofortress, deciding to reduce the number of B-47 wings at March Air Force Base from two to one.

[24] In 1963, SAC received authority from Headquarters USAF to discontinue its MAJCON strategic wings that were equipped with combat aircraft and to activate Air Force controlled (AFCON) units, most of which were inactive at the time which could carry a lineage and history.

[14] General William C. Westmoreland, commander of U.S. forces in South Vietnam, was convinced the B-52 could play an effective role, and he called for more bombing missions.

These B-52s were used primarily in saturation bombing of Viet Cong base areas, but later they were also used in direct tactical support of the Marine Corps’ Operation Harvest Moon and the 1st Cavalry Division's fight in the Ia Drang Valley.

By this time, most B-52 missions were carried out under Combat Skyspot, in which bombing was directed by ground radar stations, rather than being conducted using the B-52 bombardment/navigation system.

In February 1966, SAC bomber operations were brought together under the Bombardment Wing, Provisional, 4133d The squadron's second tour in Southeast Asia ended in March 1966.

[26] With the assumption of the Arc Light mission by B-52D units, the squadron resumed alert and strategic training duties, while maintaining a conventional bombing capability.

After it returned, it maintained conventional bombing capabilities until September 1989, when it was inactivated[1] as B-52Gs were being withdrawn from service and Mather was recommended for closure by the Carlucci Commission.