Engine manufacturer Aerojet Rocketdyne announced today that its AR1 engine, which its building for the United Launch Alliance (ULA) — the military's primary launch provider — has passed a major critical design review. That means the company will continue to develop the engine further to get ready for full-scale testing in 2017. But while Aerojet is making the AR1 for use in ULA's rockets, ULA hasn't said if it's actually going to use the engine or not.
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