This week in 1965, assembly of S-IU-200F/500F, the Facilities Checkout/ Dynamic Test version of the Saturn V Instrument Unit, was completed. Designed by NASA’s Marshall Space Flight Center and built by International Business Machines, the Instrument Unit served as the nerve center for the Saturn V, providing guidance and control, command and sequence of vehicle functions, telemetry and environmental control. Here, engineers conduct a system test on the Instrument Unit at IBM in Huntsville. Now through December 2022, NASA will mark the 50th anniversary of the Apollo Program that landed a dozen astronauts on the Moon between July 1969 and December 1972, and the first U.S. crewed mission – Apollo 8 – that circumnavigated the Moon in December 1968. The NASA History Program is responsible for generating, disseminating and preserving NASA’s remarkable history and providing a comprehensive understanding of the institutional, cultural, social, political, economic, technological and scientific aspects of NASA’s activities in aeronautics and space. For more pictures like this one and to connect to NASA’s history, visit the Marshall History Program’s webpage. (NASA)