It means an officer from the allied force that acts as coordinator between two commands.
English
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[spoiler]So I'd take orders from you?[/spoiler]
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No. You're your own man. You'll act as a representative of your forces to mine, and let us know what you're planning, and what we need to do to support that plan. Same goes for whoever we send to your command.
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Ok. That's fine. I'll start construction tomorrow?
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Sounds good.