The Army birthday celebration had already been planned for months. But earlier this spring, Trump announced his intention to transform the event — which coincides with his 79th birthday — into a massive military parade complete with 60-ton M1 Abrams battle tanks and Paladin self-propelled howitzers rolling through the city streets.

Some 200,000 spectators are expected to attend to see military aircraft and tanks on Flag Day, which is also Trump's birthday.