There are two major branches of the Reserve Forces: the Mobilization Reserve Forces (Korean: 동원예비군, Hanja: 動員豫備軍; Dongwon Yebigun) and the Homeland Reserve Forces (Korean: 향토예비군, hanja: 鄕土豫備軍; Hyangto Yebigun), a Home Guard type force. Soldiers who have completed their service in the Republic of Korea Armed Forces are automatically transferred to the Reserve Forces and must first serve 4 years in the Mobilization Reserve and then 4 years as an Homeland Reservist. During wartime, about 5 divisions would be formed under the Mobilization Reserves, and deployed to the war zone to provide support and regional stabilization. In the meantime, the Homeland Reserve would defend the homeland from any possible attacks from the enemy.