NASA, Boeing Complete Barrel Sections for future SLS Exploration Upper Stage Structural Test Article. These images and videos show technicians at NASAs Michoud Assembly Facility in New Orleans examining and lifting midbody barrels for the Exploration Upper Stage (EUS) structural test article of the SLS (Space Launch System) rocket in May 2023.The barrel sections make up the body, or main structure, of the future in-space propulsion stage for the mega rocket. The Exploration Upper Stage will be used on the second configuration of the SLS rocket, known as Block 1B, and will provide in-space propulsion to send astronauts in NASAs Orion spacecraft and heavy cargo on a precise trajectory to the Moon. Beginning with Artemis IV, EUS will replace the interim cryogenic propulsion stage for the Block 1 configuration of SLS. It has larger propellant tanks and four RL10 engines, enabling SLS to launch 40% more cargo to the Moon along with crew. EUS flight hardware is in early production at Michoud