Attached to the Saturn IV-B stage, the Lunar Module Adapter's four panels are retracted to the fully open position. This is where the Lunar Module (LM) is stored during launch. On missions requiring the use of a LM, the four panels would be retracted and jettisoned before rendezvous and docking. This photo was taken during the Apollo 7 mission, when no Lunar Module was carried. The SIV-B stage flew as the second stage on a Saturn IB rocket. It is also used as the third stage on the Saturn V. The Apollo 7 mission was designed to test the Apollo Command and Service Module spacecraft systems specifically. Apollo 9 was the first mission to fly the Lunar Module.