CFS Armstrong

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Canadian Forces Station Armstrong (CFS Armstrong) was a military installation located in Armstrong, Ontario.

CFS Armstrong was operated as a radar station as part of the Pinetree Line network controlled by NORAD.

The Armstrong Air Station was opened in 1952 as an installation of the United States Air Force and was home to the 914th Aircraft Control and Warning Squadron. In 1962, the station was transferred to the Royal Canadian Air Force and renamed RCAF Station Armstrong. With unification of the Canadian Forces, the facility was renamed Canadian Forces Station Armstrong in 1967. Improvements in radar technology made the site redundant, and the station was closed in 1974. The site was sold to private owners.

There was also military activity in Armstrong during the Second World War. The community was the site of a detachment of the US Army's 671st Signal Air Warning Reporting Company, established to detect an enemy air attack on the locks at Soo Locks in Sault Ste. Marie, Michigan. The site was opened in 1942 and disbanded in 1943 as an attack seemed less likely. It is believed that the facility was situated in the same place as CFS Armstrong and no trace of it remains.