In November 1945, the 98th Group was inactivated and the squadron moved to March Field, California, where it was assigned to the 40th Bombardment Group. B-29 training continued until the unit was inactivated in March 1946. The squadron was reactivated in 1947 as a Strategic Air Command (SAC) Superfortress unit at Spokane Army Air Field, Washington. The squadron performed strategic bombardment training missions until the outbreak of the Korean War. In the summer of 1950, when the Korean War began, the 19th Bombardment Wing was the only medium bomber unit available for combat in the Pacific. In August, SAC dispatched the squadron and other elements of the 98th Bombardment Group to Yokota Air Base, Japan to augment FEAF Bomber Command, Provisional. The group flew its first combat mission on 7 August against marshalling yards near Pyongyang, capital of North Korea. The squadron's missions focused on interdiction of enemy lines of communications, attacking rail lines, bridges and roads. The squadron also flew missions that supported United Nations ground forces. SAC's mobilization for the Korean War highlighted that SAC wing commanders were not sufficiently focused on combat operations. Under a plan implemented for most wings in February 1951 and finalized in June 1952, the wing commander focused primarily on the combat units and the maintenance necessary to support combat aircraft by having the combat and maintenance squadrons report directly to the wing and eliminating the intermediate group structures. This reorganization was implemented in April 1951 for the 98th Wing, when wing headquarters moved on paper to Japan, taking over the personnel and functions of the 98th Group, which became a paper organization, and the squadron began operating under wing control. Starting in January 1952, the threat posed by enemy interceptors forced the squadron to fly only night missions. The unit flew its last mission, a propaganda leaflet drop, on the last day before the armistice was signed. The squadron remained in combat ready status in Japan until July 1954 when it moved to Lincoln Air Force Base, Nebraska. The squadron disposed of its B-29s to storage at Davis–Monthan Air Force Base, Arizona. At Lincoln, the squadron was equipped with new Boeing B-47E Stratojets. it engaged in strategic bombardment training with the B-47 throughout the rest of the 1950s, into the early 1960s. From November 1955 through January 1966, the squadron deployed to RAF Lakenheath as part of Operation Reflex, standing alert at the forward deployment site. From 1958, the 343d began to assume an alert posture at its home base, reducing the amount of time spent on alert at overseas bases 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.