 Complete the following phrase:  On January 2004, Vinogradov began training as the ISS Expedition 13 crew commander. The mission was launched aboard the Soyuz TMA-8 with Vinogradov and NASA astronaut Jeffrey Williams from the Baikonour Cosmodrome in Kazakhstan on March 29, 2006. Vinogradov served as the Soyuz commander. After two days of solo flight, Soyuz TMA-8 docked with the ISS on March 31, 2006. During their mission, Vinogradov and Williams hosted two NASA shuttle crews during their stay on board the ISS. visited the ISS between 615 July 2006. The main purposes of STS-121 were to test new safety and repair techniques introduced following the 