headquarters; command post
Primarily used for military command centers; can also refer to the central command of an organization in a formal or metaphorical sense.
The headquarters was set up at a location away from the front lines.
彼は司令部に連絡を取った。
He contacted the headquarters.
The army set up its headquarters in the mountains.
An order to withdraw came down from headquarters.
The enemy attacked the command headquarters.
The headquarters relocated to the new base.