A call for peacekeepers by Somalia's new president last week revived memories of the ill-fated intervention in the 1990s, when Black Hawk helicopters were shot out of the sky and the bloodied corpses of U.S. servicemen dragged through the anarchic streets of Mogadishu. Few leaders in the world need more help to restore order in their countries than Abdullahi Yusuf, who was sworn in last week. But bruised by the memory of the failed U.S. peacekeeping mission in 1993 that forced Washington and later the United Nations to quit Somalia, the international community will treat Yusuf's appeal for engagement with caution, seeking guarantees before committing to help, analysts say.