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On October 31st, 2022, a Twitter post by the official Blue Origin account announced that the first two BE-4 engines had been delivered to ULA and were in the process of being integrated on a Vulcan rocket. In a later tweet, ULA CEO Tory Bruno said that one of the engines had already been installed on the booster, and that the other would be joining it momentarily.<ref name=":0" />
On June 30th, 2023, a BE-4 engine exploded 10 seconds into testing, resulting in damage to the test stand. The engine was intended for flight on the second Vulcan flight. Blue Origin has claimed to know the cause, however, as of July 12th, 2023, they have not released this information.<ref>{{Cite web |last=Sheetz |first=Michael |date=2023-07-11 |title=Jeff Bezos’ Blue Origin rocket engine explodes during testing |url=https://www.cnbc.com/2023/07/11/jeff-bezos-blue-origin-be-4-rocket-engine-explodes-during-testing.html |access-date=2023-07-12 |website=CNBC |language=en}}</ref>
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