U.S. Navy accepts the first Boeing Orca XLUUV test asset - 2023-12-20 - Production Milestone - XLE0 was the Navy’s first delivered unmanned diesel-electric submarine test asset. The vehicle began in-water testing in Huntington Beach in spring 2023. The Navy said lessons from XLE0 would inform five follow-on Orca… - source: navsea.navy.mil