A platoon leader (NATO) or platoon commander (more common in Commonwealth militaries and the US Marine Corps) is the officer in charge of a platoon. This person is usually a junior officer – a second lieutenant or first lieutenant or an equivalent rank. The officer is usually assisted by a platoon sergeant. Some special units, such as specific aviation platoons and special forces, require a captain as platoon leader, due to the nature and increased responsibility of such assignments. Platoons normally consist of three or four sections (Commonwealth) or squads (US).
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Platoon leader in the context of Commander
Commander (commonly abbreviated as Cdr.) is a common naval officer rank as well as a job title in many armies. Commander is also used as a level 8 rank or title in other formal organizations, including several police forces. In several countries, this naval rank is termed as a frigate captain.
Commander is also a generic term for an officer commanding any armed forces unit, such as "platoon commander", "brigade commander" and "squadron commander". In the police, terms such as "borough commander" and "incident commander" are used.