STS-128 (ISS assembly flight 17A) was a NASA Space Shuttle mission to the International Space Station (ISS) that launched on August 28, 2009. carried the Multi-Purpose Logistics Module Leonardo as its primary payload. Leonardo contained a collection of experiments for studying the physics and chemistry of microgravity. Three spacewalks were carried out during the mission, which removed and replaced a materials processing experiment outside ESA's Columbus module, and returned an empty ammonia tank assembly. The mission's first launch attempt was delayed due to weather concerns, including multiple weather violations in NASA's launch rules, beginning over two hours before the scheduled launch. The second launch attempt, scheduled for August 26, 2009, at 01:10:22 EDT, was called off the previous evening due to an anomaly in one of the orbiter's fuel valves. The launch finally took place on August 28, 2009, at 23:59 EDT. Discovery landed on September 11, 2009, at Edwards Air Force Base, which was the last landing of a shuttle to occur at the California site. Crew Crew notes Nicole Stott was originally scheduled to return aboard Soyuz TMA-15, but a change in the flight plan was made due to the possible flight delays in future shuttle missions, which could have extended Canadian astronaut Robert Thirsk's mission beyond the six-month duration preferred for station crew members. STS-128 was the final Space Shuttle flight used for ISS crew rotation, with Nicole Stott replacing Tim Kopra. Stott returned on STS-129, but that flight did not bring her replacement. The mission of Christer Fuglesang was named Alissé by the European Space Agency. The name was proposed by Jürgen Modlich from Baierbrunn, Germany. The name refers to the 15th-century explorers who used the trade winds to follow Christopher Columbus across the oceans to the New World. STS-128 also marked the first time two Hispanic Americans were on the same crew. John "Danny" Olivas of El Paso, Texas, made his second trip into space, and José M. Hernández of Stockton, California, made his first. Both are of Mexican heritage. Mission payload Multi-Purpose Logistics Module (MPLM) Leonardo The primary payload of STS-128 was the Multi-Purpose Logistics Module Leonardo to assist with establishing a six-man crew capacity by bringing extra supplies and equipment to the station. The Multi-Purpose Logistics Module contained three racks for life support, a crew quarter to be installed in Kibo, a new treadmill (COLBERT) that will temporarily be placed in Node 2