UNAMSIL
The United Nations Mission in Sierra Leone (UNAMSIL)
From http://www.un.org/Depts/dpko/missions/unamsil/
"On 22 October 1999, the Security Council established UNAMSIL to cooperate with the Government and the other parties in implementing the Lome Peace Agreement and to assist in the implementation of the disarmament, demobilization and reintegration plan. On 7 February 2000, the Council revised UNAMSIL's mandate. It also expanded its size, as it did once again on 19 May 2000 and on 30 March 2001."
UNAMSIL replaced a previous mission, the United Nations Observer Mission in Sierra Leone (UNOMSIL).