question: When did the plane that the Vought XF8U-3 Crusader II was designed to compete against enter service with the U.S. Navy?
answer: 1960
context: Title: SM U-41 (Austria-Hungary)
  Passage: SM "U-41 or U-XLI" was a "U-27" class U-boat or submarine for the Austro-Hungarian Navy.  "U-41", built by the Austrian firm of Cantiere Navale Triestino (CNT) at the Pola Navy Yard, was launched in November 1917.  When she was commissioned in February 1918, she became the last boat of her class to enter service.  She was also the last domestically constructed Austro-Hungarian U-boat to enter service.
  Title: Vought XF5U
  Passage: The Vought XF5U "Flying Flapjack" was an experimental U.S. Navy fighter aircraft designed by Charles H. Zimmerman for Vought during World War II.  This unorthodox design consisted of a flat, somewhat disc-shaped body (hence its name) serving as the lifting surface.  Two piston engines buried in the body drove propellers located on the leading edge at the wingtips.
  Title: McDonnell Douglas F-4 Phantom II
  Passage: 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.  It first entered service in 1960 with the U.S. Navy.  Proving highly adaptable, it was also adopted by the U.S. Marine Corps and the U.S. Air Force, and by the mid-1960s had become a major part of their air wings.
  Title: Vought XF8U-3 Crusader III
  Passage: The Vought XF8U-3 Crusader III was an aircraft developed by Chance Vought as a successor to the successful Vought F-8 Crusader program and as a competitor to the McDonnell Douglas F-4 Phantom II.  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.
  Title: USS North Carolina (BB-55)
  Passage: USS "North Carolina" (BB-55) was the lead ship of "North Carolina"-class battleship s and the fourth warship in the U.S. Navy to be named for the State of North Carolina.  She was the first newly constructed American battleship to enter service during World War II, and took part in every major naval offensive in the Pacific Theater of Operations; her 15 battle stars made her the most decorated American battleship of World War II.  She is now a museum ship and memorial kept at the seaport of Wilmington, North Carolina.
  Title: Vought F7U Cutlass
  Passage: The Vought F7U Cutlass was a United States Navy carrier-based jet fighter and fighter-bomber of the early Cold War era.  It was a highly unusual, semi-tailless design, allegedly based on aerodynamic data and plans captured from the German Arado company at the end of World War II, though Vought designers denied any link to the German research at the time.  The F7U was the last aircraft designed by Rex Beisel, who was responsible for the first fighter ever designed specifically for the U.S. Navy, the Curtiss TS-1 of 1922.
citations: McDonnell Douglas F-4 Phantom II Vought XF8U-3 Crusader III