John McCain served as a pilot in the Vietnam War and was shot down, captured, and tortured. He broke both arms and a knee when ejecting from his plane.

McCain was held at the infamous Hanoi Hilton prisoner camp for five and a half years. He only received life-saving treatment for his injuries when his captors discovered that he was the son of an admiral. They offered McCain early release, which he turned down knowing it would be used as propaganda. He suffered permanent injuries, including the inability to raise his arms above his head.

McCain died in 2018, having served as a US Senator for Arizona for three decades.

During Trump’s campaign, he rebuffed the assertion that McCain was a war hero:

He hit me, he’s not a war hero. He’s a war hero because he was captured. I like people that weren’t captured, okay? I hate to tell you.

Trump avoided the military draft for Vietnam five times and called dodging STDs his “personal Vietnam.”

Politico – Trump attacks McCain: ‘I like people who weren’t captured’
Time – Inside John McCain’s Journey From Annapolis to the Hanoi Hilton: How He Became a Prisoner of War
Wikipedia – John McCain (Prisoner of War)