Of the 11 companies selected, there are obviously Boeing,
Lockheed-Martin and Aerojet Rocketdyne.
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The central core booster's Aerojet Rocketdyne RS-68A engine continued fired until the upper
stage's single RL10B-2 engine ignited to continue the climb to space.
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Ball Aerospace, a spacecraft manufacturer in Colorado,
has been working with subcontractor Aerojet Rocketdyne and NASA scientists to develop a propulsion system for the green fuel.