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I've been a sailer since I was twelve years old (I'm now a senior citizen). Even though my old optometrist told me mine was the worst case of red-green weak he had ever seen, I never had any trouble distinguishing a red running light from a green running light. They just aren't in the shades that tend to tail off into grey.
Ammo in Vietnam wasn't a problem ... whatever they gave me, I put it in my weapon and shot it.
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