NASA's modified Gulfstream G-III aircraft provides a platform to test and evaluate a variety of new technologies, and can also be used to gather scientific data for geological studies or earthquake prediction. The G-III airframe has been structurally modified to incorporate a MAU-12 ejector rack on the bottom of the fuselage on which a variety of experiments can be mounted.

As a Multi-Role Cooperative Research Platform, the heavily instrumented twin-turbofan aircraft provides long-term capability for efficient testing of subsonic flight experiments for NASA, the U.S. Air Force, other government agencies, academia, and private industry. Originally designated a C-20A by the Air Force, the aircraft was declared excess by that service and transferred to NASA Dryden at Edwards AFB, Calif., in September 2002.