Caribou Air Force Station
Caribou Air Force Station, also known as North River Depot and East Loring, is a defunct Air Force Station that operated from 1951 until some time when it was absorbed into Loring Air Force Base in 1962. It was located in Limestone, Maine, adjacent to Loring. Between 1951 and 1962 Caribou was an Operational Storage Site for Air Materiel Command (AMC-OSS), one of five in the United States, and the weapons storage and maintenance facility for Loring alert aircraft.
RCAF Station St. Margarets
The Royal Canadian Air Force selected the community of St. Margarets for the location of a radar station in the early 1950s to close a key gap in air defence coverage. RCAF Station St. Margarets was constructed on what was then called the Old Yellow Road, today Highway 11, approximately northwest of the county line between Northumberland County and Kent County and approximately southeast of the air base at RCAF Station Chatham. Construction began in 1951 under general contractor Diamond Construction and it went operational on November 1, 1953, as part of the Pinetree Line network of radar stations when the ground control intercept operation was moved from RCAF Station Chatham.