orderly room

the administrative office of a small military unit.

Origin of orderly room

probably earlier than 1975–80

From thence he dashed into the orderly-room, and knocked at the inner door, where the orderly officer for the night was on duty.

Dastral of the Flying Corps |Rowland Walker
Will had, from the first week after the arrival of the mission, fallen into the position of an orderly-room sergeant.

For Name and Fame |G. A. Henty
He left everything to somebody else, the second-in-command, the adjutant, the orderly-room.

The Secret Battle |A. P. Herbert
I heard Captain Harvey say in the orderly-room that they have arranged relays of bearers every five miles all the way down.

The Lost Heir |G. A. Henty

Then, having severed the telephone wire communicating with the orderly-room, Dacres knocked at the door.

The Dreadnought of the Air |Percy F. Westerman

orderly room

military a room in the barracks of a battalion or company used for general administrative purposes