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Bezos noted in 2016 that the Vulcan launch vehicle is being designed around the BE-4 engine; ULA switching to the AR1 would require significant delays and money on the part of ULA.<ref name=ft20160312/> This point had also been made by ULA executives, who clarified that the BE-4 is likely to cost 40% less than the AR1, as well as benefit from Bezos capacity to "make split-second investment decisions on behalf of BE-4, and has already demonstrated his determination to see it through. [whereas the] AR1, in contrast, depends mainly on U.S. government backing, meaning Aerojet Rocketdyne has many phone numbers to dial to win support".<ref name=sn20160317>{{cite news |last=Foust |first=Jeff |url=http://spacenews.com/ula-vp-resigns-following-remarks-on-companys-competitive-position-strategy/ |title=ULA VP resigns following remarks on company's competitive position, strategy |work=[[SpaceNews (publication)|SpaceNews]] |date=2016-03-17 |access-date=2016-03-17 |archive-date=2016-12-18 |archive-url=https://archive.today/20161218193022/http://spacenews.com/ula-vp-resigns-following-remarks-on-companys-competitive-position-strategy/ |url-status=live }}</ref>
Vulcan was finally launched on 8 January 2024, where the engines performed flawlessly allowing rocket to propel [[Peregrine Mission One]] to [[Trans-lunar injection]]. Vulcan is the first methane fueled rocket to reach orbit on its first attempt, and the first to reach orbit from the US.<ref>{{Cite news |last=Belam |first=Martin |date=2024-01-08 |title=Nasa Peregrine 1 launch: Vulcan Centaur rocket carrying Nasa moon lander lifts off in Florida – live updates |url=https://www.theguardian.com/science/live/2024/jan/08/nasa-peregrine-1-launch-rocket-moon-latest-news-updates-live |access-date=2024-01-08 |work=the Guardian |language=en-GB |issn=0261-3077}}</ref>
=== New Glenn ===
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