I'm color blind too, but have always managed to pass the DOT test, no problems. Worried that when I took the written test for my pilots license that I'd be restricted to daytime opps only, but that too seemed to be a myth. When in high school, the recruters wouldn't leave me alone, because my color-blindness made me a great candidate for a tank spotter. What is camouflaged to everyone else isn't so much to guys like us, also everyone's best hunting mate during the seasons because the game you have a difficult time seeing, to me it is almost like there is a fine black outline around them. Buddies may sometimes spot one before me, but I'll always spot the rest that are right there with them. The marriage between my back country flying certificate and my ability to spot game via the local grapevine, typically has my dance card filled with hunters who have drawn permits in difficult areas when the hunt is on to help them to get in the right area. All perfectly legal, so long as there is no communication with anyone on the ground giving a location. We get back to the airsrtip, I'll draw a map or two on the hood of their truck, and wish them well. Gotten me more than a few pounds of prime elk steak in the past!