Vela started out as a small budget research program in 1959. It ended 26 years later as a successful, cost-effective military space system, which also provided scientific data on natural sources of space radiation. In the 1970s, the nuclear detection mission was taken over by the Defense Support Program (DSP) system, and in the late 1980s, augmented by the Navstar Global Positioning System (GPS) satellites. The program is now called the Integrated Operational Nuclear Detection System (IONDS).
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