Editing Lockheed U-2 (section)

===U-2E/F/H details===
[[File:U-2F refueling from KC-135Q.jpg|thumb|A [[Lockheed Corporation|Lockheed]] U-2F being refueled by a [[Boeing KC-135 Stratotanker|KC-135Q]]]]

In May 1961, in an attempt to extend the U-2's already considerable range, Lockheed modified six CIA U-2s and several USAF U-2s with aerial refueling equipment, which allowed the aircraft to receive fuel from either the [[Boeing KC-97 Stratofreighter|KC-97]] or from the [[Boeing KC-135 Stratotanker|KC-135]]. This extended the aircraft's range from approximately {{convert|4000|to|8000|nmi|km|sigfig=2|sp=us}} and extended its endurance to more than 14 hours. The [[Pratt & Whitney J57|J57]]-powered U-2Bs were re-designated U-2E and the [[Pratt & Whitney JT4A|J75]]-powered U-2Cs were redesignated U-2F.{{sfn|Polmar|2001|p=173}} Each modified U-2 also included an additional oxygen cylinder. However, pilot fatigue was not considered, and little use was made of the refueling capability. The only U-2H was both air refueling-capable and carrier-capable.<ref>{{YouTube|JvOeUnZDpps|"Video of U-2 refueling"}}. Retrieved: 26 December 2009</ref><ref>Pocock, Chris. [http://www.spyflight.co.uk/u-2s.htm "Lockheed U-2C/TR-1/U-2R/S."] {{Webarchive|url=https://web.archive.org/web/20080321185533/http://www.spyflight.co.uk/u-2s.htm |date=21 March 2008 }} ''spyflight.com'', 6 January 2008. Retrieved: 8 March 2009.</ref>