ICPS is a modified Delta IV Cryogenic Second Stage for NASA's Artemis program.
For the Artemis I mission, the stage will feed liquid hydrogen and liquid oxygen to the Aerojet Rocketdyne RL10B-2 main engine to produce 24,750 pounds (110.1 kilo-Newtons) of highly efficient thrust.
ULA is building three ICPS stages for each of the first three Artemis missions to the Moon through a collaborative partnership with Boeing.
NASA's SLS with ICPS is the most powerful rocket ever developed, producing 8.8 million pounds of thrust during liftoff to loft a vehicle weighing nearly six million pounds.
ICPS-2: Rendezvous target guides Artemis II Orion demonstrations
ICPS-3: Upperstage that will propel Artemis III astronauts to the Moon arrives for processing