In some military organisations, the commander of a Headquarters unit.
In line with the two meanings above, a person responsible for the internal workings, especially internal security of a military installation, responsible only to its commanding officer.
The highest military authority in a town and adjacent area in non-combat area, mainly responsible for the coordination of the depots and training centers.
In the British Army , between 1922 and 1928 , a Colonel-Commandant was an appointment held by senior Colonel s, later replaced by the rank of Brigadier .
In the British Army, the Colonel-Commandant is the honorary commander of some corps, usually a member of the Royal Family or a senior or retired General .
In the Irish army, a rank below lieutenant-colonel and above captain, equivalent to major in other armies
