If you're confused about your
plumbing gun weapon um...
equipment!, how in the hell are you going to maintain combat readiness?
Well, something like that...
Does our military really need people who are tormented about something so basic in situations where they may be subject to far greater and more fundamental stresses?
If we want the best to operate increasingly complex weapons systems in increasingly more demanding environments, it doesn't hurt to start with people who have their stuff together to begin with.