It’s a patriotic display with pageantry three times over.

The Big Apple will be celebrating a historic 250 years of military service in the US Tuesday – honoring a trio of trailblazing grand marshals at the 106th annual Veterans Day Parade.

The commemoration, considered to be the nation’s largest Veterans Day tribute, will honor grand marshals from the Army, Navy and Marine Corps — including once-stranded NASA astronaut and retired Navy Capt. Sunita “Suni” Williams.

“The 250th anniversary … really ties us back to the beginning of the nation: this is when the Revolutionary War started,” said Mark Otto, executive director of the United War Veterans Council, which organizes the parade each year.

“This is when America was but a dream, and it was just people coming together and forming our

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