The British Aircraft Corporation TSR-2 was a cancelled Cold War strike and reconnaissance aircraft developed by the British Aircraft Corporation (BAC) for the Royal Air Force (RAF) in the late 1950s and early 1960s. The TSR-2 was designed to penetrate a well-defended forward battle area at low altitudes and very high speeds, and then attack high-value targets in the rear with nuclear or conventional weapons. Another aspect of its combat role was to provide high-altitude, high-speed photo reconnaissance, requirements that necessitated incorporating "state-of-the-art" aviation technology that made it the highest-performing aircraft in these roles. Although only one prototype was completed, test flights confirmed that the aircraft would be able to meet its stringent design specifications.
The TSR-2 was the most visible victim of the Defence "White Paper" that, along with inter-service squabbling over Britain's future defence needs, led to the controversial decision to scrap the programme in 1965. With the election of a new government, the TSR-2 was ostensibly cancelled due to rising costs, in favour of purchasing the General Dynamics F-111, an "off-the-shelf" decision that itself was later rescinded as costs and development times skyrocketed. The interim replacements included the Blackburn Buccaneer and McDonnell Douglas F-4 Phantom II, both types being previously considered and rejected early in the TSR-2 procurement process. Eventually, the smaller swing-wing Panavia Tornado was developed and adopted by a European consortium to fulfill broadly similar requirements that the TSR-2 was already meeting during tests in 1965.