The parade, honoring the Army’s long-planned 250th anniversary celebration and coinciding with Trump’s 79th birthday, is set to step off from the Lincoln Memorial under the threat of stormy weather in Washington and protests around the country tied to a turbulent week of immigration enforcement that has involved military deployment in Los Angeles.

The United States Army will hold its 250th Birthday Festival throughout the day on Saturday with a parade later in the afternoon. It's also President Donald Trump's 79th birthday, and Flag Day.