That a big reason that motivated Garp to stay with the Marines for over half a century is because he looked up to a certain someone, or was even saved by a certain someone, when Garp was younger. Not to say that the simple reason of “I’m a Marine because I want to help people” is out of the question, but considering how a big reason that motivated Luffy to pursue the goal of Pirate King is because of him looking up to Shanks, it makes me wonder.