The problem you are going to hit in the Navy is that ships, aircraft, submarines, etc all use red and green lights and objects prominently for navigation. If you are having problems discerning either or both of those colors quickly and accurately from a distance, and in unfavorable conditions (rain, snow, fog, etc), you well may become a hazard to navigation. As I recall, the ultimate determinant re colorblindness is the Falant Lantern test; it is about as simple as it can be, but very definitive. I don't see NAVY flexing very far on this issue; too much would be put at risk.