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A United Launch Alliance Delta 4 Heavy rocket launched NROL-91 for the National Reconnaissance Office Sept. 24, 2022, from Vandenberg Space Force Base, California. Credit: ULA

Each of the Delta 4 Heavy’s common booster cores is powered by Aerojet Rocketdyone’s RS-68A main engines. The Delta cryogenic second stage is powered by an RL10C-2-1 engine. The rocket uses liquid hydrogen and liquid oxygen in all stages.

Read More A United Launch Alliance Delta 4 Heavy rocket launched NROL-91 for the National Reconnaissance Office Sept. 24, 2022, from Vandenberg Space Force Base, California. Credit: ULA