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Aerospace Data Facility-Colorado (ADF-C) or Space Delta 20 (DEL 20) one of three satellite ground stations operated by the National Reconnaissance Office (NRO) and United States Space Force in the continental United States. [1]
The Chidlaw Building is a former United States Air Force facility located in the Knob Hill neighborhood of Colorado Springs, Colorado.The building was close to, but not within, the Ent Air Force Base complex, and was leased by the military for several decades, housing headquarters for several military commands, starting with the Air Defense Command (ADC) and the North American Aerospace ...
The new Air Defense Command (ADC) at Ent AFB, and Army Antiaircraft Command (ARAACOM) staffed in the nearby Antlers Hotel (Colorado) was established in 1951. The same year, the Priority Permanent System began replacing the post-war Lashup Radar Network.
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L-xx Original Air Defense Command (ADC) 1946 "Lashup" Radar Network of temporary sites to provide detection at designated important locations using radar sets left over from World War II. LP-xx "Lashup" site which was incorporated into the first ADC permanent radar network in 1949. P-xx Original 75 permanent stations established in 1949.
ADC squadrons at Thule Site J and Clear AFS used each AN/FPS-50 to sweep 2 radar beams each ~1° in azimuth x 3.5° elevation (illustrated much less thick). Azimuth sweeping created a "Lower Fan" centered at 3.5° elevation and "Upper Fan" at 7° (both illustrated much higher) with "revisit time of 2 sec" for ICBM detection.
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29th Air Division ADC AOR 1951–1960. Assigned to Air Defense Command (ADC) for most of its existence, the division's mission was the air defense of Montana, Idaho, Wyoming, and parts of Nevada, Utah, and Colorado. By 1953, the area changed to include North Dakota, South Dakota, and Nebraska.