[{"n": "A-7 (rocket engine)", "u": "/e/rocket-engines-of-the-united-states/a-7-rocket-engine/", "s": "Rocketdyne A-7 engine modified for crewed Mercury-Redstone flights."}, {"n": "Aerojet LR87", "u": "/e/rocket-engines-of-the-united-states/aerojet-lr87/", "s": "Twin-chamber rocket engine for Titan missiles and launch vehicles."}, {"n": "AJ-60A", "u": "/e/rocket-engines-of-the-united-states/aj-60a/", "s": "Solid rocket booster for Atlas V, used through 2020."}, {"n": "BE-3", "u": "/e/rocket-engines-of-the-united-states/be-3/", "s": "Cryogenic engine for New Shepard and New Glenn."}, {"n": "BE-4", "u": "/e/rocket-engines-of-the-united-states/be-4/", "s": "Methane-fueled staged combustion engine for Vulcan and New Glenn."}, {"n": "BE-7", "u": "/e/rocket-engines-of-the-united-states/be-7/", "s": "Dual expander cycle engine for Blue Origin lunar landers."}, {"n": "SpaceX Draco", "u": "/e/rocket-engines-of-the-united-states/spacex-draco/", "s": "Hypergolic rocket engine family for SpaceX capsules."}, {"n": "Rocketdyne F-1", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-f-1/", "s": "Most powerful single-chamber liquid rocket engine ever flown."}, {"n": "Fastrac (rocket engine)", "u": "/e/rocket-engines-of-the-united-states/fastrac-rocket-engine/", "s": "NASA's low-cost turbopump-fed liquid rocket engine for the X-34."}, {"n": "Integrated Powerhead Demonstrator", "u": "/e/rocket-engines-of-the-united-states/integrated-powerhead-demonstrator/", "s": "Demonstrator of a full flow staged combustion rocket engine powerhead."}, {"n": "Rocketdyne J-2", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-j-2/", "s": "Cryogenic rocket engine for Saturn IB and Saturn V."}, {"n": "J-2S", "u": "/e/rocket-engines-of-the-united-states/j-2s/", "s": "Upgraded J-2 variant cancelled after Apollo."}, {"n": "J-2X", "u": "/e/rocket-engines-of-the-united-states/j-2x/", "s": "Cryogenic upper-stage engine for Constellation and SLS."}, {"n": "Aerojet M-1", "u": "/e/rocket-engines-of-the-united-states/aerojet-m-1/", "s": "Large hydrogen-fueled engine designed for Air Force launch needs."}, {"n": "SpaceX Merlin", "u": "/e/rocket-engines-of-the-united-states/spacex-merlin/", "s": "SpaceX's Merlin engine family powers Falcon 9 and Falcon Heavy."}, {"n": "SpaceX Raptor", "u": "/e/rocket-engines-of-the-united-states/spacex-raptor/", "s": "First full-flow staged combustion engine to fly."}, {"n": "RL10", "u": "/e/rocket-engines-of-the-united-states/rl10/", "s": "First US liquid hydrogen rocket engine, used on Centaur and Delta upper stages."}, {"n": "Rocketdyne AR2", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-ar2/", "s": "Liquid-fuelled rocket engine for aircraft thrust augmentation."}, {"n": "Rocketdyne E-1", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-e-1/", "s": "Backup engine for Titan I, precursor to Saturn I."}, {"n": "Rocketdyne H-1", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-h-1/", "s": "Liquid-propellant engine used on Saturn I and Saturn IB first stages."}, {"n": "Rocketdyne LR-101", "u": "/e/rocket-engines-of-the-united-states/rocketdyne-lr-101/", "s": "Vernier thruster for Atlas, Thor, and Delta launch vehicles."}, {"n": "RocketMotorTwo", "u": "/e/rocket-engines-of-the-united-states/rocketmotortwo/", "s": "Hybrid rocket engine for SpaceShipTwo suborbital spaceplane."}, {"n": "RS-18", "u": "/e/rocket-engines-of-the-united-states/rs-18/", "s": "Reconfigured LMAE tested with LOX and liquid methane."}, {"n": "RS-27", "u": "/e/rocket-engines-of-the-united-states/rs-27/", "s": "A modernized H-1 derivative for Delta first stages."}, {"n": "RS-68", "u": "/e/rocket-engines-of-the-united-states/rs-68/", "s": "Largest hydrogen-fueled rocket engine ever flown."}]