ISS012-E-05983 (23 Oct. 2005) --- Astronaut William S. McArthur Jr. (right), Expedition 12 commander and NASA science officer, dons his Extravehicular Mobility Unit (EMU) spacesuit in the Quest Airlock of the international space station. Cosmonaut Valery I. Tokarev, flight engineer representing Russia's Federal Space Agency, assisted McArthur. When the Expedition 12 crew performs its first scheduled day of spacewalking on Nov. 7, it will be attired in the NASA EMU.