The Irgun was led by a High Command, which set policy and gave orders. Directly underneath it was a General Staff, which oversaw the activities of the Irgun. The General Staff was divided into a military and a support staff. The military staff was divided into operational units that oversaw operations and support units in charge of planning, instruction, weapons caches and manufacture, and first aid. The military and support staff never met jointly; they communicated through the High Command. Beneath the General Staff were six district commands: Jerusalem, Tel Aviv, Haifa-Galilee, Southern, Sharon, and Shomron, each led by a district commander. A local Irgun district unit was called a "Branch". A "brigade" in the Irgun was made up of three sections. A section was made up of two groups, at the head of each was a "Group Head", and a deputy. Eventually, various units were established, which answered to a "Center" or "Staff".