Ft. Worth, Texas

The claim: Federal prison under construction on the site of Carswell AFB.

What it really is: Carswell Air Force Base was shut down in 1994 and realigned as the Naval Air Station Fort Worth Joint Reserve Base, Carswell Field (NAS Fort Worth JRB), and is now controlled by the Navy. The base is also host to the Texas Air National Guard and the Air Force Reserve Command.

The west side of the base also still serves as Air Force Plant No. 4 and employs 17,000 personnel, who are primarily Lockheed Martin employees.

There is also no Federal prison there. There is however a Federal Medical Center there that provides specialized medical and mental health services to female inmates.