Well they are mentioned in mission tasking. Otherwise I don't think there's much of anything special to the grids other than just being another set of coordinates! What else would one expect them to be?
Oh yea, got another silly one for you:
All radio messages still originate from COMSUBPAC
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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