The Convair B-36J Peacemaker was a strategic bomber designed to fly across continents, unrefueled, and unescorted, to deliver nuclear weapons from the US arsenal. Production of the B-36J Peacemaker suffered immediate delays; the piston-powered engines were already obsolete against mid 1950s supersonic jet technology. President Dwight D. Eisenhower took office in 1953 and proposed a new look at national defense. The US Congress funded the US Air Force B-36J Peacemaker; but mechanical failures, engine fires, costly maintenance, and production cost run-ups quickly deemed it a military spending debacle. The B-36J's slow speed made it an easy target for the 1950s Soviet MiG-15 jet interceptor aircraft. So in 1956 the mammoth B-36J was scrapped and replaced by the Boeing B-47 Stratojet. As the last of the Peacemaker line, the B-36J finally left Biggs AFB in 1959 and was put on display in Fort Worth.