Astronaut Portraits and Expedition 21

JSC2009-E-208079 (31 Aug. 2009) --- Attired in Russian Sokol launch and entry suits, backup spaceflight participant Barbara Barrett (left); Russian cosmonaut Alexander Skvortsov, backup Soyuz commander and Expedition 21 flight engineer; and NASA astronaut Shannon Walker, backup Expedition 21 commander and flight engineer, take a break from training in Star City, Russia to pose for a portrait. Photo credit: Gagarin Cosmonaut Training Center