This film tells the story of the Aleutian Dewline, a network of radar outposts that stretched across the Aleutian Islands, operated by the U.S. Air Force. This film describes the construction of the Distant Early Warning System, a series of radar sites in Northern Canada and Alaska that stretched 3000 miles along . USAF DEWLine documentary showing the design and construction of the Distant Early Warning radar line in the 1950s. more at DESCRIBES THE CONSTRUCTION ALONG A 3000 MILE LINE OF A SERIES OF RADAR SITES IN NORTHERN .