the major reasons why the smaller C-5 (later renamed Saturn V) was chosen instead of the originally planned Moon vehicle. The runway was slowly transformed into Saturn Boulevard in the 1960s with the middle becoming a heliport and decommissioned by the 1970s. The majority of the NASA factory's history was focused on construction and production of NASA's Space Shuttle external tank (ET). Beginning with the rollout of ET-1 on June 29, 1979, which flew on STS-1, 136 tanks were produced throughout the Space Shuttle program, ending with the flight-ready tank ET-122, which flew on STS-134, rolled out on September 20, 2010. A single tank produced at the facility, ET-94, was not used in spaceflight and remained at Michoud as a test article. Modular parts for the International Space Station were fabricated at the facility in the mid-1990s until 2010. The factory is now the location for the Space Launch System (SLS)'s core and future second stage construction by Boeing. SLS is the most powerful rocket in the history of spaceflight. It carries the Orion spacecraft, whose crew module is also being built at Michoud, but by Lockheed Martin. It has 50% more volume than the Apollo command capsule and will carry four to six astronauts. The first launch occurred on November 16, 2022. Hurricane Katrina The facility did not experience significant flooding during Hurricane Katrina due to a natural ridge that runs along its northwestern boundary, the levee that makes up the southern and eastern boundaries, and the work of the pump operators who stayed to protect the facility during the storm. Several buildings sustained wind and rainwater damage. All shifts were initially canceled up to September 26, 2005, potentially setting back future Shuttle flights. All the buildings and the shuttle hardware within survived the hurricane without grave damage, but the roof of the main manufacturing building was breached and debris damaged ET-122 stored inside; that tank was refurbished and later flew on the final flight of Space Shuttle Endeavour, STS-134. Thirty-eight NASA and Lockheed Martin employees stayed behind during Hurricane Katrina to operate the pumping systems, knowing that if not activated and sustained, the facility would have been destroyed. The workers pumped more than one billion gallons (3,800,000 m3) of water out of the facility and probably were the reason that the rocket factory suffered very little damage. These employees were each awarded the NASA Exceptional Bravery Medal, NASA's