From the record
“The Minuteman Missile National Historic Site is an American national historic site established in 1999 near Wall, South Dakota, to illustrate the history and significance of the Cold War, the nuclear arms race, and intercontinental ballistic missile (ICBM) development. The site preserves the last intact Minuteman II ICBM system in the United States, in a disarmed and demilitarized status.”
Wikipedia article Minuteman Missile National Historic Site, CC BY-SA 4.0.
One of 7 National Register listings published here for Jackson County · listed in 1999 · category: Site · built in 1999.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service