Vulture6 is 
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Re: Dumb Question: What's a Chalk?
They used to write the number of the "stick" on the concrete of the hangar floor or the tarmac in chalk. Soldiers were instructed to find their number or "chalk" and line up. The "chalk" was a group organized for the purpose of movement, and would revert back into the appropriate command structure once on the ground. Anyway, that's the origin.
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