Home / Companies / L3Harris (ARDÉ) / RS-25 Core Stage Engines (×4) Hardware RS-25 Core Stage Engines (×4) Aerojet Rocketdyne (L3Harris) / NASA Four RS-25 engines on SLS core for Artemis I. CompaniesL3Harris (ARDÉ)OEMNASAAerojet Rocketdyne FlightsArtemis I2022-11-16 · First integrated Artemis flight test: uncrewed SLS Block 1 + Orion. Cargo RS-25 Core Stage Engines (×4) Sourcesnasa.gov