Wright-Patterson Air Force Base was reallocated as an army training facility in 2067, due to the Chinese invasion of Alaska. Many soldiers were trained here over the next ten years, and much research on high tech weaponry and alien technology was done. In 2077, the Chinese bombers destroyed the airstrips, and some of the outlying buildings before US fighters took them down, sparing some of the buildings from the bombs.
Also, Bunker 18 was a topic of many rumors and stories. It was theorized to research everything from captured aliens to FEV. Bunker 18 always had multiple guards at each entry point.