Compare the pair:
I know who I'd rather had my back.
Trump: Five time draft dodger
McCain:
On July 29, 1967, McCain, by then a
lieutenant commander, was near the epicenter of the
USS Forrestal fire. He escaped from his burning jet and was trying to help another pilot escape when a bomb exploded;
[28] McCain was struck in the legs and chest by fragments.
[29] The ensuing fire killed 134 sailors and took 24 hours to control.
[30][31] With the
Forrestal out of commission, McCain volunteered for assignment with the
USS Oriskany, another
aircraft carrier employed in
Operation Rolling Thunder.
[32] Once there, he would be awarded the
Navy Commendation Medal and the
Bronze Star for missions flown over North Vietnam.
[33]
Prisoner of war
McCain's capture and subsequent imprisonment began on October 26, 1967. He was flying his 23rd bombing mission over
North Vietnam when his
A-4E Skyhawk was shot down by a missile over
Hanoi.
[34][35] McCain fractured both arms and a leg ejecting from the aircraft,
[36] and nearly drowned when he parachuted into
Trúc Bạch Lake.
[34] Some North Vietnamese pulled him ashore, then others crushed his shoulder with a rifle butt and bayoneted him.
[34]
McCain was then transported to Hanoi's main
Hỏa Lò Prison, nicknamed the "Hanoi Hilton".
[35]
Although McCain was badly wounded, his captors refused to treat his injuries, beating and interrogating him to get information; he was given medical care only when the North Vietnamese discovered that his father was a high-ranking admiral.
[37] His status as a
prisoner of war (POW) made the front pages of major newspapers.
[38][39]
McCain spent six weeks in the hospital while receiving marginal care.
[34] By then having lost 50 pounds (23 kg), in a chest cast, and with his gray hair turned white as snow,
[34] McCain was sent to a different camp on the outskirts of Hanoi
[40] in December 1967, into a cell with two other Americans who did not expect him to live a week.
[41] In March 1968, McCain was put into
solitary confinement, where he would remain for two years.
[42]
In mid-1968, John S. McCain Jr. was named commander of all U.S. forces in the Vietnam theater, and the North Vietnamese offered McCain early release[43] because they wanted to appear merciful for propaganda purposes,[44] and also to show other POWs that elite prisoners were willing to be treated preferentially.[43]
McCain turned down the offer; he would only accept repatriation if every man taken in before him was released as well. 
