At the time of writing, production of a new 'Top Gun' movie is well underway, with Tom Cruise returning to the part which helped launch his career thirty years ago. Somewhere in an alternative universe, it isn't Cruise revisiting his past - it's Matthew Modine, who was originally marked for the part of Maverick. Modine's career arguably needed the boost more than Cruise's did, but Modine's anti-military stance stopped him from signing on.
Modine felt like 'Top Gun' glorified the military, and didn't believe it was an appropriate stance to take at the height of the Cold War. Somewhere between 'Top Gear' and 'Full Metal Jacket,' that moral standpoint went out of the window. Modine performed admirably as Private Joker in the movie, but he would never go on to achieve the same level of success that Cruise has enjoyed throughout his career. It could all have been so different for him.