2000: Sierra Leone: On May 12, 2000, a U.S. Navy patrol craft deployed to Sierra Leone to support evacuation operations from that country if needed.[RL30172] 2000: Nigeria: Special Forces troops are sent to Nigeria to lead a training mission in the country.[12] 2000: Yemen: On October 12, 2000, after USS Cole attack in the port of Aden, Yemen, military personnel were deployed to Aden.[RL30172] 2000: East Timor: On February 25, 2000, a small number of U.S. military personnel were deployed to support the United Nations Transitional Administration in East Timor (UNTAET). [RL30172] 2001: On April 1, 2001, a mid-air collision between a United States Navy EP-3E ARIES II signals surveillance aircraft and a People's Liberation Army Navy (PLAN) J-8II interceptor fighter jet resulted in an international dispute between the United States and the People's Republic of China called the Hainan Island incident.