GE Aerospace T408-GE-400 turboshaft family, formerly designated GE38 and developed with MTU Aero Engines for Sikorsky's CH-53K King Stallion heavy-lift helicopter. The production engine is rated at 7,500 shaft horsepower; the CH-53K uses three T408 engines and achieved U.S. Marine Corps Initial Operating Capability in April 2022. GE's 2026 Lots 9–13 contract covers new production, spares, and sustainment, supporting an active in-service and production lifecycle.