A UH-1N Iroquois helicopter from the 1st Helicopter Squadron here glides between the U.S. Air Force Memorial and Pentagon Dec. 29 in Arlington, VA. The UH-1N is a light-lift utility helicopter used to support varied Air Force missions. Its primary function includes airlift of emergency security and disaster response forces, the emergency evacuation of key government officials, and airlift of distinguished visitors and missile support personnel. (U.S. Air Force Photo/Senior Airman Perry Aston)