Bomber Command's other main function was to provide tanker aircraft to the RAF. The Valiant was the first bomber used as a tanker operationally. As high-level penetration declined as an attack technique, the Valiant saw more and more use as a tanker until the retirement of the type in 1965 due to the costs of remediating metal fatigue. With the Victor also unsuited to the low-level role six were converted to tankers to replace the Valiants, before the later conversion of the majority of Victors to tankers. The Vulcan also saw service as a tanker, but only in an improvised conversion during the Falklands War of 1982. Ironically, in the tanker role, the Victor not only outlived Bomber Command, but also all the other V bombers by nine years.