They are located west of the Vehicle Assembly Building, where the orbiter was mated with its external tank and Solid Rocket Boosters before transport to the launch pad.

Any remaining payloads from the previous mission were removed and the vehicle was fully inspected, tested, and refurbished.

Remaining payloads, fuels and fluids were installed on the pad closer to launch day.

[4] NASA furthermore stated that renovations of the two hangars would be completed by the end of 2014; the main doors of OPF-1 were marked with the message "Home of the X-37B" by this point.

[4] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.