The Indonesian National Armed Forces (Indonesian Tentara Nasional Indonesia) is a group of military forces that are part of the Indonesian National Armed Forces. The military forces of Indonesia are known as the Indonesian National Military, or TNI. It consists the Army (TNI–AD), Navy (TNI–AL), and Air Forces (TNI–AU). The commander-in-chief for the Armed Forces is the President of Indonesia. It will be home to approximately 395,500 military personnel by 2021. The Indonesian Armed Forces was formed during the Indonesian National Revolution. It began a guerrilla warfare with informal militia. Due to this and the need for internal security, the Armed Forces, including the Army and Navy, were organized along territorial lines.