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In 1962, in response to advances in Soviet Union surface-to-air missile (SAM) technology, the V-force fleet including the Valiant changed from high-level flying to flying at low-level to avoid high altitude SAM attacks. In 1964 it was found that Valiants showed fatigue and crystalline corrosion in wing rear spar attachment forgings. In late 1964 a repair programme was underway, but a change of Government led to the new Minister of Defence Denis Healey deciding that the Valiant should be retired from service,
The origin of the Victor and the other V bombers is heavily linked with the early British atomic weapons programme and nuclear deterrent policies that were developed in the aftermath of the Second World War. The atom bomb programme formally began with Air Staff Operational Requirement OR.1001 issued in August 1946, which anticipated a government decision in January 1947 to authorise research and development work on atomic weapons; the U.S. Atomic Energy Act of 1946 (McMahon Act) prohibited exporting atomic knowledge, even to countries that had collaborated on the Manhattan Project.[1] OR.1001 envisaged a weapon not to exceed 24 ft 2 in (7.37 m) in length, 5 ft (1.5 m) in diameter, 10,000 lb (4,500 kg) in weight, and suitable for release from 20,000 ft (6,100 m) to 50,000 ft (15,000 m).
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Valiants of No. 543 Squadron at RAF Wyton were modified to serve in the photographic reconnaissance role. In one notable operation in 1965, Valiants of No. 543 Squadron photographed around 400,000 square miles (1,000,000 km2) of Rhodesia across an 11-week period.
In 1956, Vickers had performed a series of low level tests in WZ383 to assess the type for low level flight at high speed.
In 1956, Vickers had performed a series of low level tests in WZ383 to assess the type for low level flight at high speed.