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Teams with NASA’s Exploration Ground Systems Program integrate the interim cryogenic propulsion stage to the SLS (Space Launch System) launch vehicle stage adapter on Thursday, May 1, 2025, inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The four-story propulsion system, built by Boeing and ULA (United Launch Alliance), is powered by an RL10 engine that will enable the Orion spacecraft to build up enough speed for the push toward the Moon during the Artemis II crewed test flight. Photo credit: NASA/Isaac Watson
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program integrate the interim cryogenic propulsion stage to the SLS (Space Launch System) launch vehicle stage adapter on Thursday, May 1, 2025, inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The four-story propulsion system, built by Boeing and ULA (United Launch Alliance), is powered by an RL10 engine that will enable the Orion spacecraft to build up enough speed for the push toward the Moon during the Artemis II crewed test flight. Photo credit: NASA/Isaac Watson
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program integrate the interim cryogenic propulsion stage to the SLS (Space Launch System) launch vehicle stage adapter on Thursday, May 1, 2025, inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The four-story propulsion system, built by Boeing and ULA (United Launch Alliance), is powered by an RL10 engine that will enable the Orion spacecraft to build up enough speed for the push toward the Moon during the Artemis II crewed test flight. Photo credit: NASA/Isaac Watson
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program integrate the interim cryogenic propulsion stage to the SLS (Space Launch System) launch vehicle stage adapter on Thursday, May 1, 2025, inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The four-story propulsion system, built by Boeing and ULA (United Launch Alliance), is powered by an RL10 engine that will enable the Orion spacecraft to build up enough speed for the push toward the Moon during the Artemis II crewed test flight. Photo credit: NASA/Isaac Watson
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program integrate the interim cryogenic propulsion stage to the SLS (Space Launch System) launch vehicle stage adapter on Thursday, May 1, 2025, inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The four-story propulsion system, built by Boeing and ULA (United Launch Alliance), is powered by an RL10 engine that will enable the Orion spacecraft to build up enough speed for the push toward the Moon during the Artemis II crewed test flight. Photo credit: NASA/Isaac Watson
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program transport the upper stage for the agency’s Artemis II SLS (Space Launch System) rocket from the Multi-Payload Processing Facility (MPPF) at NASA’s Kennedy Space Center in Florida to the spaceport’s Vehicle Assembly Building on Wednesday, April 16, 2025. Technicians fueled the SLS upper stage, known as the interim cryogenic propulsion stage, with hydrazine for its reaction control system at the MPPF and will now integrate the four-story propulsion system with SLS rocket elements atop mobile launcher 1. Photo credit: NASA/Cory S Huston
NASA image use policy.

The upper stage for NASA’s Artemis II SLS (Space Launch System) rocket sits in the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida on Wednesday, April 16, 2025, after teams with the agency’s Exploration Ground Systems Program transported the four-story propulsion system from the spaceport’s Multi-Payload Processing Facility (MPPF). Technicians fueled the SLS upper stage, known as the interim cryogenic propulsion stage, with hydrazine for its reaction control system at the MPPF and will now integrate the four-story propulsion system with SLS rocket elements atop mobile launcher 1. Photo credit: NASA/Cory S Huston
NASA image use policy.

Teams with NASA’s Exploration Ground Systems Program transport the upper stage for the agency’s Artemis II SLS (Space Launch System) rocket from the Multi-Payload Processing Facility (MPPF) at NASA’s Kennedy Space Center in Florida to the spaceport’s Vehicle Assembly Building on Wednesday, April 16, 2025. Technicians fueled the SLS upper stage, known as the interim cryogenic propulsion stage, with hydrazine for its reaction control system at the MPPF and will now integrate the four-story propulsion system with SLS rocket elements atop mobile launcher 1. Photo credit: NASA/Cory S Huston
NASA image use policy.

Over the weekend, the interim cryogenic propulsion stage (ICPS) for the NASA Artemis II mission was transported from United Launch Alliance’s Delta Operations Center in Cape Canaveral to NASA's Kennedy Space Center. Next, NASA's Exploration Ground Systems technicians will fuel the SLS upper stage before transporting it to the center’s Vehicle Assembly Building for integration with the SLS rocket elements atop mobile launcher 1.

NASA's Space Launch System ICPS was built at the ULA facility in Decatur, Alabama, near NASA's Marshall Space Flight Center.

Credit: United Launch Alliance

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The upper stage for NASA's SLS (Space Launch System) rocket that will power the agency's Artemis III mission and send astronauts on to the Moon for a lunar landing arrived at the Cape Canaveral Space Force Station Poseidon Wharf in Florida on Aug. 9, 2023. Known as the SLS ICPS (interim cryogenic propulsion stage), it will undergo final checkouts by contractors Boeing and ULA (United Launch Alliance) at ULA's facilities before it is delivered to NASA's nearby Kennedy Space Center. Photo credit: United Launch Alliance
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The second Interim Cryogenic Propulsion Stage (ICPS), built by ULA under a collaborative partnership with The Boeing Company, undergoes testing and preps to help launch four pioneering astronauts on NASA's Artemis Il mission around the Moon. Photo credit: United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft lifts off from Launch Pad 39B at Kennedy Space Center in Florida on Nov. 16. United Launch Alliance (ULA) under a collaborative partnership with Boeing, built the Interim Cryogenic Propulsion Stage (ICPS) upper stage of the SLS rocket that propels Orion to the Moon. Photo by United Launch Alliance