Tibbets returned to the United States in February 1943 to help with the development of the Boeing B-29 Superfortress. In September 1944, he was appointed the commander of the 509th Composite Group, which would conduct the bombings of Hiroshima and Nagasaki. After the war, he participated in the Operation Crossroads nuclear weapon tests at Bikini Atoll in mid-1946, and was involved in the development of the Boeing B-47 Stratojet in the early 1950s. He commanded the 308th Bombardment Wing and 6th Air Division in the late 1950s, and was military attaché in India from 1964 to 1966. After leaving the Air Force in 1966, he worked for Executive Jet Aviation, serving on the founding board and as its president from 1976 until his retirement in 1987.