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| | Vanguard |
 | | Vanguard Test Vehicle (TV-1), a modified Martin Viking first-stage and Vanguard solid-propellant third-stage Grand Central Rocket as second-stage, launched with instrumented nose cone to an altitude of 121 miles and met all test objectives. |
 | | IGY Vanguard prototype (TV-2) with simulated second and third stage successfully met test objectives, by reaching 109-mile altitude and 4,250 mph. |
 | | Vanguard also provided the second stage for the Able, Delta, and Able-Star, as well as the third stage of Scout, pioneering solid-propellant stages used in Polaris and Minuteman. |
| www.astronautix.com /project/vanguard.htm (504 words) |
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