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I’m in error should be Super Roadrunner. It’s a hypersonic speed capable solid booster used on the Holloman high speed sled track at China Lake.I posted on the X-51 thread why not an Roadrunner II booster with TBG front end.
What is the Roadrunner II?
https://ca.finance.yahoo.com/news/aerojet-rocketdyne-produce-joint-economical-184200218.html