Three C-130s were modified under a top secret project at Eglin Air Force Base Auxiliary Field #1 (Wagner Field), Florida. The contract called for two to be modified to the proposed XFC-130H configuration within 90 days, and the third to be used as a test bed for various rocket packages blistered onto the forward and aft fuselage, which theoretically enabled the aircraft to land and take off within the sports arena's confines. (A fourth aircraft, an EC-130 ABCCC, was used as the interior mockup airframe for simulator training.)