Final RS-25 Engine Delivered to KSC — All Four Artemis III Core Stage Engines Now on Site

The fourth and final RS-25 engine for the Artemis III SLS core stage was delivered to the Vehicle Assembly Building at Kennedy Space Center on July 21, 2026, from NASA's Stennis Space Center. Technicians began integrating the engines with the core stage over the summer, running roughly four months ahead of the equivalent point in the Artemis II campaign.