Expedition 24 Flight Engineer Tracy Caldwell Dyson signs the inside of the Russian helicopter that took her from the Soyuz TMA-18 spacecraft landing site near Arkalyk, Kazakhstan to Karaganda, Kazakhstan on Saturday, Sept. 25, 2010. Russian Cosmonauts Skvortsov and Kornienko and NASA Astronaut Caldwell Dyson returned from six months onboard the International Space Station where they served as members of the Expedition 23 and 24 crews. Photo Credit: (NASA/Bill Ingalls)