SM-65B Atlas

The Convair SM-65B Atlas, or Atlas B, also designated X-12 was a prototype of the Atlas missile. First flown on 19 July 1958, the Atlas B was the first version of the Atlas rocket to use the stage and a half design with an operational sustainer engine and jettisonable booster section, in addition to an operational guidance computer. On August 2, Missile 4B, identical to 3B aside from minor venting changes, was successfully launched from LC-13 on a 2500-mile flight. All systems functioned normally and booster section separation, which was tested for the first time, occurred on schedule.

SM-65B Atlas

The Convair SM-65B Atlas, or Atlas B, also designated X-12 was a prototype of the Atlas missile. First flown on 19 July 1958, the Atlas B was the first version of the Atlas rocket to use the stage and a half design with an operational sustainer engine and jettisonable booster section, in addition to an operational guidance computer. On August 2, Missile 4B, identical to 3B aside from minor venting changes, was successfully launched from LC-13 on a 2500-mile flight. All systems functioned normally and booster section separation, which was tested for the first time, occurred on schedule.