The Boeing doublebody, winged booster, known as Model 832-40
made use of a Dyna-Soar glider as the crew module and escape capsule.
Powered by twin clusters made up of 4 Rocketdyne J-2B rocket engines for vertical boost and 3 hydrogen-fueled, General Electric MF239C Turbofan engines for horizontal flight and landing. Designed for use with a variety of upper stages

Source: https://media.defense.gov/2021/Apr/06/2002615086/-1/-1/0/RECOVERABLE%20BOOSTERS.PDF

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