Many deaths and weird accidents in the 70-80s were covered-up. Haunted grounds overseas classified as training accidents, or news never report about the death of a whole truckload of our soldiers in Taiwan, Vietnam, etc. Some local camps were haunted because of sucides, accidents, some officers were cult members and prayed to Lucifer.
For my personal experience, I knew there was a locked file cabinet in my army S1 store, whenever it was opened, we called it the X-Files of the camp. Whenever, it was opened to add new docs, it meant something bad happened to a soldier in the camp.