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USAF officials have denied that the program is an attempt to create a backup engine program for the F-35.<ref>Wright, Austin. [http://www.politico.com/news/stories/0512/76408.html "Lawmakers suspect jet engine end run."] ''Politico'', 16 May 2012.</ref>
With the threat of the GE/RR F136, Pratt & Whitney has funded an adaptive fan variant of its F135, that may qualify for the follow-on ''Adaptive Engine Technology Development'' (AETD) program under the US [[Air Force Research Laboratory]].<ref>Majumdar, Dave. [http://www.flightglobal.com/news/articles/farnborough-pratt-to-test-new-adaptive-fan-f135-variant-next-year-374283/ "FARNBOROUGH: Pratt to test new adaptive fan F135 variant next year."] ''Flight International'', 12 July 2012.</ref>
In 2012, GE was chosen to continue its ADVENT work into the AETD program.<ref>Brooks, Robert. [http://americanmachinist.com/news/usaf-taps-ge-develop-new-jet-engines "USAF Taps GE to Develop New Jet Engines."] ''American Machinist'', 21 October 2012.</ref> GE and Pratt & Whitney were selected over Rolls Royce to continue the AETD program to mature fuel-efficient, high-thrust powerplants.<ref>Warwick, Graham. [http://www.aviationweek.com/Article.aspx?id=/article-xml/asd_09_18_2012_p01-02-496815.xml "Pratt In, Rolls Out, GE Stays On AFRL Advanced Engine Demo."] ''Aviation Week'', 18 September 2012.</ref> Operational testing of the engine was expected to begin in 2013.<ref name="rrpress"/>
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