Mar 17 1961

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Vanguard I completed third year in orbit and was still transmitting. Vanguard I provided much useful data on orbits, including the slight pear-shape of the Earth and the effect of solar pressure. 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.

First Northrop T-38 supersonic jet trainer was delivered to USAF Air Training Command at Randolph Air Force Base, Tex.

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