Tindallgrams

Terms & Abbreviations: S

S-II

Second stage of a Saturn V rocket.

S-IVB

The second stage of a Saturn IB or the third stage of a Saturn V.

Sears, Norman E.

Member of the MIT Instrumentation Lab

SPS

Service Propulsion System, the large engine of the Service Module that was used to enter and exit lunar orbit, as well as make course corrections while going to and from the moon.