He never did full decks well, wasn't it him that accidentally released his missiles as a Lt in the Navy, resulting in Injury and Death?
NOT HIM
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
The Report I saw was that a jet fuel powered electric generator was parked directly underneath the wing of one of the aircraft and it's exhaust stream ended up pointing directly at one of the missiles on the wing, causing the missile's warhead to explode, and thereby triggering the fire.
Now I don't know if this is true, but I believe that is the official cause of the accident. I will point out that McCain's father was a Navy Admiral, and if influence could play a role in an investigation, it likely would have occurred here.