A 1st Helicopter Squadron UH-1N Iroquois helicopter turns toward the Potomac River, during a training mission Jan 17 near Oxon Hill, Md. The UH-1N is a light-lift utility helicopter used to support varied Air Force missions. Its primary functions include the airlift of emergency security and disaster response forces, the emergency evacuation of key government officials and the airlift of distinguished visitors and missile support personnel. (U.S. Air Force Photo/Senior Airman Perry Aston)