The Vanguard rocket was intended to be the first launch vehicle the United States would use to place a satellite into orbit. The Naval Research Laboratory proposal, based on the Viking sounding rocket, was chosen in 1955 for the International Geophysical Year satellite, and the Martin company, which had also built the Viking, became prime contractor for the three-stage vehicle. After the surprise launch of Sputnik 1 and the failure of Vanguard TV-3, the United States quickly orbited Explorer 1 with a Juno I rocket instead, making Vanguard 1 the second successful American orbital launch. Vanguard rockets were used from 1957 to 1959 and, of eleven attempted launches, three placed satellites in orbit.
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The Martin company, which had also built the Viking, became prime contractor for the launch vehicle.
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the first launch vehicle the United States would use to place a satellite into orbit
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1. Vanguard (rocket) (Wikipedia)
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Vanguard rockets were used by Project Vanguard from 1957 to 1959
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the first launch vehicle the United States would use to place a satellite into orbit
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The Martin company, which had also built the Viking, became prime contractor for the launch vehicle.
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