Jon Stewart, David Letterman help USO celebrate 75th birthday. Yes, there's a Trump joke.

The USO turned 75 on Thursday, and its birthday party at Joint Base Andrews in Maryland was attended by President and Michelle Obama, Vice President Joe Biden and his wife, Jill, and hosted by Jon Stewart. Stewart kicked off the evening by welcoming the various branches of the military, making a joke about the "joint" part of Joint Base Andrews, and introducing Biden.

"He's always a guy, you know, we had a lot of fun with ... he's a guy that's unpredictable," Stewart said, after noting Biden's long history with the military and military families. "He'll say whatever he kind of thinks of, whatever comes to his mind, sort of impulsive. Sometimes, you might think to yourself, 'That sounds crazy,' or 'Man, that is crazy.' And who would have thought that now, that gets you the Republican nomination." That got a loud reaction. "Don't worry," Stewart said, "Trump's gonna keep you busy. You're going to have to repaint all the planes with TRUMP in big gold letters." "I was going to say something nice about Jon, but to hell with him," Biden joked when he walked up to the podium.

When David Letterman walked out to cut the cake, his beard made Stewart's look like 5 o'clock stubble. He joked about someone backstage mistaking him for Walt Whitman, ribbed Obama and Biden for talking like they were running for office again, and said it was easy to get him to agree to the gig. "I'm pretty much ready to go and happy to be out of the house."

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After Letterman ushered out the cake, the rest of the show — featuring comedians like Judd Apatow, Hasan Minhaj, Kristen Schaal, and Jeff Ross — was closed to the media. "You are in store tonight for what will be the best show in the United States tonight," Letterman said. "Except maybe Hamilton."