The Week In Defense, May 17-24, 2018

Credit: Aerojet Rocketdyne
United Launch Alliance (ULA) has not yet announced whether it will stick with original plans to buy Blue Origin BE-4 engines to power the first stage of its Vulcan rocket or switch to Aerojet Rocketdyne’s AR1. But when the Vulcan debuts in 2020, its Centaur upper stage will be powered by Aerojet’s...

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