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 "Vought XF8U-3 Crusader III"): Though based in spirit on the F8U-1 and F8U-2, and sharing the older aircraft's designation in the old Navy system, the two aircraft shared few parts.
Relevant evidence: No