There’s a big parade in Washington, D.C. Saturday evening. On the streets: tanks and thousands of soldiers. In the air: flyovers and parachute jumps. And for taxpayers, a big price tag: as much as $45 million. It’s all to honor the Army’s 250th anniversary, which is also President Donald Trump’s 79th birthday. Military historian Richard Kohn joins John Yang to discuss.

There’s a big parade in Washington, D.C. Saturday evening. On the streets: tanks and thousands of soldiers. In the air: flyovers and parachute jumps. And for taxpayers, a big price tag: as much as $45 million. It’s all to honor the Army’s 250th anniversary, which is also President Donald Trump’s 79th birthday. Military historian Richard Kohn joins John Yang to discuss.