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==Current applications for the RL10==
*[[Atlas V]] [[Centaur (rocket stage)]]: The single engine centaur (SEC) version uses the RL10C-1,<ref name=":1" /> while the dual engine centaur (DEC) version retains the smaller RL10A-4-2.<ref name="EA10A1"/> An Atlas V mission (SBIRS-5) marked the first use of the RL10C-1-1 version. The mission was successful but observed unexpected vibration, and further use of the RL10C-1-1 model is on hold until the problem is better understood.<ref>{{cite web |url=https://spacenews.com/ula-delays-further-use-of-enhanced-upper-stage-engine-pending-studies/ |title=ULA delays further use of enhanced upper-stage engine pending studies |date=June 23, 2021 }}</ref> The engine was used again successfully on SBIRS-6.
*[[Delta Cryogenic Second Stage]]: The current DCSS has an RL10C-2-1 with an extensible nozzle.<ref name=":1" /><ref>{{cite web|title=ULA Vulcan Launch Vehicle (as announced/built) – General Discussion Thread 3|url=https://forum.nasaspaceflight.com/index.php?topic=44390.msg1937019#msg1937019|access-date=2020-06-06|website=forum.nasaspaceflight.com}}</ref><ref>{{cite web|title=Delta IV Data Sheet|url=https://www.spacelaunchreport.com/delta4.html|access-date=2020-06-06|website=www.spacelaunchreport.com}}</ref>
*[[Interim Cryogenic Propulsion Stage]] : The Interim Cryogenic Propulsion Stage or ICPS is used for the SLS and is similar to the DCSS, except that the engine is an RL10B-2 and it is adapted to fit on top of the 8.4 meter diameter core stage with four [[RS-25]] Space Shuttle Main Engines.
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| [[Centaur (rocket stage)|Centaur SEC]]<br />Centaur DEC
| <ref name="CPS">{{cite web |url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110015783.pdf |title=Cryogenic Propulsion Stage |date=August 5, 2011 |publisher=NASA |access-date=October 11, 2014}}</ref><ref>{{cite web|url=http://forum.nasaspaceflight.com/index.php?topic=34891.0|title=Atlas-V with RL10C powered Centaur|website=forum.nasaspaceflight.com|access-date=April 8, 2018}}</ref><ref>{{cite web |title=Evolution of Pratt & Whitney's cryogenic rocket engine RL-10 |url=http://b14643.de/Spacerockets/Diverse/P&W_RL10_engine/index.htm |access-date=February 20, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160303141931/http://b14643.de/Spacerockets/Diverse/P%26W_RL10_engine/index.htm |archive-date=March 3, 2016 |df=mdy-all }}</ref><ref name=":0">{{cite web |title=RL10 Engine |url=http://www.rocket.com/rl10-engine |publisher=Aerojet Rocketdyne |access-date=March 13, 2016 |archive-date=April 30, 2017 |archive-url=https://web.archive.org/web/20170430183058/http://www.rocket.com/rl10-engine |url-status=dead }}</ref>
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| RL10C-1-1
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