Why Trump's military parade is so controversial

Huge crowds have taken to the streets of major cities from New York to Los Angeles to protest President Donald Trump. The protests are the largest against Trump since he was re-elected, and came on the day that thousands of troops, military vehicles and aircraft rolled through Washington in an unusual display of American might. The parade was in honor of the US Army's 250th birthday, and it just happened to coincide with the president's 79th.
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