"Vulcan Launch Delayed to Late 2023 Due to Anomalies and Investigation"

United Launch Alliance (ULA) plans to launch its next-generation Vulcan rocket, despite recent anomalies involving the Centaur V upper stage and the BE-4 engines. The Centaur V upper stage was destroyed during a test due to a hydrogen leak, while one of the BE-4 engines exploded during a test firing. ULA is working on modifications and fixes for both issues, including adding a stainless steel ring to strengthen the Centaur V and changing the welding procedure. The first certification flight of Vulcan is expected to occur in late 2023 or early 2024, with full vehicle certification anticipated in the first quarter of 2024.