STS-128 was a Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Discovery. The mission launched on August 28, 2009, and was the twentieth shuttle mission to visit the ISS. The primary objective of the mission was to deliver and install the Leonardo Multi-Purpose Logistics Module (MPLM), which was filled with supplies and equipment for the ISS, and to perform maintenance and repair work on the station. The mission also included the rotation of the crew of the ISS.