This dual position Saturn I/IB test at the T-Stand at Marshall Space Flight Center in Huntsville, Alabama, allowed engineers to test two articles at the same time to compare identical engine burns. The test stand is a historical landmark. The early Saturn vehicles were stepping stones in the development of the Saturn V that sent men to the Moon. The Saturn I missions launched important test flights. The sixth Saturn I mission sent a boilerplate Apollo spacecraft into orbit on May 28, 1964.
Image credit: NASA/MSFC