Before revision: Examples are: Cheyenne Mountain Complex Chiashan Air Force Base Dulce Base Iranian underground missile bases Raven Rock Mountain Complex Zeljava Air Base There are more than 10,000 underground military facilities worldwide.
After revision: Examples are: Cheyenne Mountain Complex Chiashan Air Force Base Iranian underground missile bases Raven Rock Mountain Complex Zeljava Air Base There are more than 10,000 underground military facilities worldwide.