The United States Air Force also operated four Pinetree Line stations further east at Stephenville, St. Anthony, Gander and St. John's on Newfoundland.
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The SITU formed on July 7, 1975 at St. Margarets and supported NORAD's space defence role to collect, analyze and transmit satellite tracking data to the NORAD Space Object Identification Centre at NORAD headquarters in the Cheyenne Mountain Operations Center (CMOC) at Cheyenne Mountain, Colorado.
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Under SAGE, the St. Margarets station collected, discriminated and transmitted its radar coverage data to the designated SAGE Control Centre in the Bangor NORAD sector at Topsham AFS.
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