Thule Site J (J-Site) is a United States Space Force (USSF) radar station in Greenland near Thule Air Base for missile warning and spacecraft tracking. The northernmost station of the Solid State Phased Array Radar System, the military installation was built as the 1st site of the RCA 474L Ballistic Missile Early Warning System and had 5 of 12 BMEWS radars. The station has the following structures: "EWR facility": structure with a Solid State Phased Array Radar System (SSPARS) phased array radar BMEWS radar buildings: 3 of the 4 former AN/FPS-50 buildings, 1 AN/FPS-49A building Support structures: e.g., buildings with telecommunication equipment at the station's "support site" (cf. "technical site" with radar)—15 major structures were complete in 1961 (i.e., Bldg 98 which was for the original BRCS) History BMEWS General Operational Requirement 156 was issued on November 7, 1957 (BMEWS had originally been "designed to go with the active portion of the WIZARD system") and on February 4, 1958; the USAF informed Air Defense Command (ADC) that BMEWS was an "all-out program" and was "...being placed on the Department of Defense master urgency list." On January 14, 1958, the US announced its "decision to establish a Ballistic Missile Early Warning System" with Thule to be operational in 1959—total Thule and Clear Air Force Station costs in a May 1958 estimate were ~$800 million (an October 13, 1958, plan for both estimated completion in September 1960.) A World War II ship (freighter) operated by the Burns & Roe company originally provided the Site J electrical and heating supplies until a powerplant was constructed years later, and water was from Thule AB via a branch to the site. Construction Kiewit was contracted for heavy construction (e.g., the AN/FPS-50 reflector foundations and tunnels between transmitter buildings), and construction began in May 1958 (a trial reflector installation failed due to ordinary carbon steel bolts instead of 1.5% chrome steel.) The maintenance building with electric heat was the first building complete; and the four AN/FPS-50 reflectors with 25-ton foundations were complete by August 8, 1959 ("two pedestals for trackers" were built for deferred radars.) After the July 13, 1959, treaty No. 5045 with Canada regarding intermediate sites, the Western Electric BMEWS Rearward Communications System (BRCS) was established between the "switchboard at Thule and the BMEWS Project Office in New York City"—a similar line between Thule and Massachusetts used a summer 1959 "submarine cable... between Thule