to the increased costs, none of the SR.2s were modified, and only 21 Victor K.2 tankers were converted. Handley Page went into liquidation in August 1969, and the subsequent work was undertaken by Hawker Siddeley. The first Victor K.2 tanker made its maiden flight on 1 March 1972. No. 55 Squadron began re-equipping with the Victor K.2 on 1 July 1975, followed by No. 57 Squadron on 7 June 1976. No. 214 Squadron retained its K.1As until it was disbanded on 28 February 1977, reducing the RAF's tanker fleet to just two squadrons. During the Falklands War, the commitments of the Victor tanker fleet became overwhelming. All available tankers were deployed to support operations there. Only the Victor tanker fleet made it possible for the transport aircraft to reach Ascension Island with vital supplies, and for the Vulcan bombers to reach the Falkland Islands for Operation Black Buck. In the meantime, the RAF forces in the UK were serviced by USAF Boeing KC-135 Stratotankers. Work was in progress to convert VC-10s into tankers, but as an interim measure it was decided to convert some Lockheed C-130 Hercules and Vulcan bombers. The equipment in the ECM bay was removed and a Mark 17 HDU installed there. The first of six converted Vulcan tankers (XH561 - the others being XH558, XH560, XJ825, XL445 and XM571) flew on 18 June 1982, just seven weeks after the conversion work began, and the first Vulcan K.2 tanker was delivered to the RAF five days later. The HDUs used were those earmarked for the VC-10 conversion programme, so as these were completed, the HDUs were removed from the Vulcans, starting with Vulcan XJ825 on 4 May 1983. No. 617 Squadron was disbanded on 31 December 1981, followed by No. 35 Squadron on 1 March 1982, and No. 9 Squadron on 1 May 1982. This left only Nos 44, 50 and 101 Squadrons at RAF Waddington, which were all scheduled to disband by 1 July 1982, with their tactical nuclear mission passing to the Panavia Tornado. The Falklands War intervened, providing a temporary reprieve. No. 101 Squadron was disbanded on 4 August 1982, and No. 44 Squadron on 21 December 1982. The last Vulcan unit, No. 50 Squadron at RAF Waddington, was disbanded on 13 March 1984, leaving behind six K.2s and three B.2s. The Ministry of Defence decided to retain a Vulcan in service for air