I grew up in Dayton so I've heard this story for nearly 40 years. The story is this: After the alien spacecraft(s) crashed at Roswell, NM in the late 1940s, the government transfered the dead alien bodies to Wright-Patterson AFB (then known as Wright Field). Supposedly they have been in Hangar 18 since. The History Channel show claimed that there is a secret network of underground tunnels on the base to move things around in case someone starts snooping. The old 70s show "In Search Of" did a program on it as well.
No one has ever produced any real evidence that they exist but it's always been an urban legend in Dayton. In the early 1990s I was working as a traffic engineer in Dayton and my company had a job to do a traffic study on the base. When we met with the Base Engineer to discuss the scope, he had a map of the base and was pointing our different buildings and at one point said "..and here's where the alien bodies are!" He was joking...
or was he?!?