An engine of billionaire Jeff Bezos' Blue Origin's BE-4 rocket exploded during testing at a facility in West Texas on June 30, causing significant damage to the engine and the test stand infrastructure. The engine was being tested for use on United Launch Alliance's second Vulcan rocket launch, and its failure could potentially delay the launch, which has already been rescheduled for the fourth quarter of this year. Blue Origin confirmed the incident and stated that it is assessing the root cause of the issue. The company assured that it would be able to meet its engine delivery commitments and continue testing in West Texas. The BE-4 engines are crucial for both ULA's Vulcan rocket and Blue Origin's own reusable New Glenn rocket. ULA stated that the testing issue is not expected to affect its plans for the Vulcan launch. The incident comes after ULA experienced its test explosion earlier this year, requiring modifications to the upper stage of the Vulcan rocket.