Chandler Air Force Station Chandler Air Force Station is a closed United States Air Force General Surveillance Radar station . It is south of Chandler , Minnesota , on the Buffalo Ridge in section 13 of Moulton Township , Murray County . It was closed in 1969 . History . In late 1951 Air Defense Command selected the site as one of twenty - eight radar stations built as part of the second segment of the permanent radar surveillance network . Prompted by the start of the Korean War , on July 11 , 1950 , the Secretary of the Air Force asked the Secretary of Defense for approval to expedite construction of the second segment of the permanent network . Receiving the Defense Secretary ’ s approval on July 21 , the Air Force directed the Corps of Engineers to proceed with construction . The 787th Aircraft Control and Warning Squadron was activated at Moulton , MN on 27 June 1951 . The site was equipped with AN / FPS - 3 and AN / FPS - 4 radars , and initially the station functioned as a Ground - Control Intercept ( GCI ) and warning station . As a GCI station , the squadron ' s role was to guide interceptor aircraft toward unidentified intruders picked up on the unit ' s radar scopes . The site was named Chandler Air Force Station ( AFS ) on 1 December 1953 . By 1959 these sets had been replaced by AN / FPS - 20 and AN / FPS - 6 radars , and the AN / FPS - 20 set was upgraded and redesignated as an AN / FPS - 64 , and a second height - finder radar ( AN / FPS - 26 ) was added in 1961 . During 1961 Chandler AFS joined the Semi Automatic Ground Environment ( SAGE ) system , initially feeding data to DC - 11 at Grand Forks AFB , North Dakota . After joining , the squadron was redesignated as the 787th Radar Squadron ( SAGE ) on 1 April 1961 . The radar squadron provided information 24 / 7 the SAGE Direction Center where it was analyzed to determine range , direction altitude speed and whether or not aircraft were friendly or hostile . Chandler AFS was later switched to SAGE Data Center DC - 22 at Sioux City AFS , Iowa in 1963 . On 31 July 1963 , the site was redesignated as NORAD ID Z - 18 . In 1965 Chandler AFS was operating an AN / FPS - 27 set , and the AN / FPS - 64 was inactivated . The Air Force ordered radar operations to cease on 2 July 1969 , and inactivated the 787th Radar Squadron on 30 September 1969 . Air Force teams dismantled and removed the radars and communications equipment throughout the summer of 1969 . The domes came down from the two height - finder radars , leaving only one dome remaining over the search radar . A small unit stayed behind for over a year to run that radar for the Federal Aviation Administration . The government subsequently sold the radar site to a developer and the housing area to a group of investors . Buyers removed the homes and the developer salvaged materials from the radar site , but was unable to find a commercial tenant or buyer , Today what was Chandler AFS has been obliterated , being demolished in June 1993 after sitting derelict for decades . A radio transmitter station now stands on the site , and what appears to be a large overgrown pile of concrete on the site which may be the remains of the Air Force structures . The site is located at " 339 State Highway 91 , Chandler MN 56122 " under the county - wide 9 - 1 - 1 address system . External links .