I'm also red/green color weak (red/green deficiency is not color "blind," it is color weak). I didn't know it until the U.S. Army told me during Combat Engineer AIT that they would prefer I not be the guy attaching colored wires to those little stick thingies that we put into the big clumps of explody stuff.
I see red, and I see green. Blaze orange is orange. It's when greens get light and red shades off into pink that I have problems. I suppose my first clue should have been kindergarten, when a classmate asked why I was coloring the ocean purple. Hey, to me purple was just a nice, dark blue ...