FILE - In this May 25, 2014, file photo, fans watch as four L-39 Albatros high-performance jet trainer aircraft flown by the Black Diamond Jet Team, a civilian-owned aerobatic jet team, perform a fly-over during the national anthem before the Indianapolis 500 IndyCar auto race at the Indianapolis Motor Speedway in Indianapolis. The anthem has been a standard part of U.S. sports games since World War II. Experts say Game 1 of the 1918 World Series between the Boston Red Sox and the Chicago Cubs helped pave the way. The song became the official national anthem in 1931. (AP Photo/Tom Strattman, File)
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