The Republic of Sierra Leone Armed Forces is largest branch of The Republic of Sierra Leone Armed Forces, and is mainly responsible for protection of the state borders, the security of administered territories and defending the national interests of Sierra Leone within the framework of its international obligations.

The Army is modelled on the United Kingdom armed forces and came into existence after independence in 1961. It has an active force of about of 14,500 personnel. military service age eligibility is from 18-49 years.