The shootout last month, in which three rangers and a Congolese army colonel were killed, highlights the challenge of protecting parks in a part of Africa plagued for decades by insurgencies, civil war, refugee flows and weak governments. Garamba's 120 rangers, backed by up to 60 Congolese soldiers, are trying to ward off rebels from nearby South Sudan, as well as ivory hunters and militias from Sudan and the Lord's Resistance Army, a Ugandan rebel group led by warlord Joseph Kony, who is accused of war crimes. Kony's fighters are killing Garamba's elephants and trading the ivory tusks for ammunition, food and uniforms in Sudanese-controlled territory, according to a report released last month by Enough Project, a watchdog group, whose findings were based on interviews with rebel defectors. The U.S.