National Security Space Launch is a program of the United States Space Force intended to assure access to space for United States Department of Defense and other United States government payloads. The
Delta IV Heavy liftoff from SLC-6
Atlas V liftoff from SLC-41
Falcon 9 liftoff from SLC-4E
Vulcan Centaur liftoff from Space Launch Complex 41 at Cape Canaveral
RL10
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The RL10 is a liquid-fuel cryogenic rocket engine built in the United States by Aerojet Rocketdyne that burns cryogenic liquid hydrogen and liquid oxygen propellants. Modern versions produce up to 110
An RL10A-4 engine in London's Science Museum
RL10A information and overview from Saturn V
The CECE at partial throttle
Second stage of a Delta IV Medium rocket featuring an RL10B-2 engine