多目的補給モジュール
STS-134 was the last scheduled flight of the Shuttle program. Because no more were planned after this, a special mission was developed as STS-335 to act as the LON mission for this flight. This would have paired "Atlantis" with ET-122, which had been refurbished following damage by Hurricane Katrina. Since there would be no next mission, STS-335 would also carry a Multi-Purpose Logistics Module filled with supplies to replenish the station.