It was first used in the Able second stage of the Vanguard rocket, in the AJ10-118 configuration.

It was there that the third stages of early Vanguard rockets, including the first two to reach orbit, were built.

The Altair was a solid-fuel rocket with a fiberglass casing, initially developed for use as the third stage of Vanguard rockets.

The Vanguard rocket launched three satellites out of eleven launch attempts:

The Vanguard rocket was intended to be the first launch vehicle the United States would use to place a satellite into orbit.

Vanguard rockets were used by Project Vanguard from 1957 to 1959.

Of the eleven Vanguard rockets which the project attempted to launch, three successfully placed satellites into orbit.

The Vanguard rocket was designed as a three-stage vehicle.

TV-2, launched on October 23, 1957 after several abortive attempts, was the first real Vanguard rocket.

Afterwards, the later Vanguard rockets had some test instrumentation removed, lightening them enough for the 20" bodies.