A U.S. Army soldier assigned to the 82nd Airborne Division teaches children how to two hand whistle while their families get food from the World Health Organization in Port-au-Prince, Haiti, on Jan. 31, 2010. The United States and other international military and civilian aid agencies are conducting humanitarian and disaster relief operations as part of Operation Unified Response in the aftermath of the earthquake that hit the area on Jan. 12, 2010.