So you want to be a Navy master-at-arms or join a ship’s security force? Know that this is a hurdle you’ll have to clear: Yep, that’s a faceful of Oleoresin Capsicum spray — a staple of master-at-arms “A” school training and part of a requirement for shipboard security force qualification. But you don’t just get a level one (directly in the face) spray shot of the (obviously) non-lethal pepper spray, which burns like the dickens and can cause breathing problems. You have to show you can fight through the pain and do your job: That guy in the Storm Trooper…