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Now THAT's an interesting remark. I had never considered the question before... Perhaps it's just a typo for QA-10D... because if it's not, it could only mean one thing, and that's the "U for Utility" class being dropped and reallocated to create a "U for Unmanned" class. At least that's the only explanation I can come up with. We need to see more mentions of the true designation to be sure. For now let's assume it WAS a typo...