Question: When did the plane that the Vought XF8U-3 Crusader II was designed to compete against enter service with the U.S. Navy?
Sentence (from "McDonnell Douglas F-4 Phantom II"): The McDonnell Douglas F-4 Phantom II is a tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber originally developed for the United States Navy by McDonnell Aircraft.
Relevant evidence: No