The military installation from which a commander performs the functions of command(noun)
WordNet. Princeton University. 2010.
Use "military headquarters" in a sentence
"Charges were apparently brought against the town of Zeleia, which had hosted the ill-fated Persian conference a few days earlier and served as the military headquarters against the Macedonians."
"I was met at the depot by Lieutenant King, adjutant of the regiment, he having been sent down from Fort D.A. Russell for that purpose by General Carr, who had learned by a telegram from military headquarters at Chicago that I was on the way."