The 21st Operations Group assumed the Cobra Dane Radar mission at Eareckson Air Station, Shemya Island, Alaska, April 1. Eareckson AS is located on the western tip of Alaska's Aleutian islands. The radar has the ability to detect objects about 2,000 miles away, and provides data for the Space Surveillance Network and the Ballistic Missile Defense System. Cobra Dane will continue to be operated by a contract workforce, and no military personnel will be assigned to the unit at Eareckson AS. (U.S. Air Force photo)