The Scout X-2B was an American expendable launch system which was flown during 1963. It was a four stage rocket based on the earlier Scout X-2 but with an Altair 2A fourth stage in place of the Altair 1A used on the X-2. It was a member of the Scout family of rockets.The Scout X-2 was an all-solid rocket with an Algol 1D first stagea Castor 1A second stage an Antares 2A third stage and an Altair 2A fourth stage.
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