Lieutenant colonel is a rank of commissioned officer in the armies and most marine forces and some air forces of the world, typically ranking above a major and below a colonel. The rank of lieutenant colonel is often shortened to simply "colonel" in conversation and in unofficial correspondence. A lieutenant colonel is typically in charge of a battalion in the army.
Indonesia — Letnan kolonel (abbreviated Letkol). All military services shares the same rank name and insignia, that is two gold jasmine buds. A lieutenant colonel in the Army usually has a billet as battalion commander, regiment/brigade chief of staff, headquarters staff, department head, or commanding any unit has the same level as battalion. In the Navy, the common billet is ship's commanding officer, squadron commander, shore department head or staff position. In the Air Force, it has the billet of squadron commander of battalion commander of Air Force Special Force's Corps. In the Marine Corps, usual billet is infantry battalion commander or infantry brigade's chief of staff, although it can command an artillery or cavalry regiment.