Somalia turned out to be Aspin's biggest headache. A civil war involving various clans had engulfed the country since 1991. Direct U.S. involvement, begun in August 1992, provided food through a military airlift and other means to the people of Somalia. In December 1992, shortly before Aspin became secretary of defense, the United States joined a new Unified Task Force (UNITAF) to provide security as well as food relief. The United States sent 26,000 troops to Somalia to join about 13,000 others from more than 20 nations. UNITAF, operating until May 1993, restored order in Somalia and distributed food widely.