 However, the program might well be considered a partial success in that on several missions telemetry of data occurred which was after all was one of the major objectives of the "North American Test Instrumentation Vehicle".Under USAF control MX-770 developed into WS-104A which developed the successful RTV-A-5 or X-10 research vehicle, and the much less successful Navaho II (XSSM-A-4, or G-26).A product of project number MX-770, NATIV - the North American Test Instrument Vehicle - was influenced by the design of the Wasserfall surface-to-air missile developed in Germany during World War II.