From the record
“The Titan Missile Museum, also known as Air Force Facility Missile Site 8 or as Titan II ICBM Site 571-7, is a former ICBM site located about 40 km (25 mi) south of Tucson, Arizona, in the United States. It was constructed in 1963 and deactivated in 1984.”
Wikipedia article Titan Missile Museum, CC BY-SA 4.0.
One of 204 National Register listings published here for Pima County · listed in 1992 · category: Site · built in 1963 · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service