This week in 1965, technicians at NASA’s Marshall Space Flight Center began testing the Saturn V Instrument Unit dynamic test article, S-IU-200D/500D. Designed by Marshall 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, the Instrument Unit for the Apollo 4 mission is hoisted for mating to the S-IVB or third stage. 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)