Stock Photo - Outside the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, the prime and backup Expedition 27 crew members take time from their pre-launch preparations to stroll down the Walk of Cosmonauts as part of the traditional activities leading to the launch of three crew members in their Soyuz TMA-21 spacecraft to the International Space Station. The prime crew members are NASA astronaut Ron Garan, flight engineer, and Russia cosmonauts Alexander Samokutyaev, Soyuz commander, and Andrey Borisenko, flight engineer. In the foreground are Garan (left), Samokutyaev (center) and Borisenko (right). In the background are backups Anatoly Ivanishin (left), Anton Shkaplerov (center) and NASA's Dan Burbank (right). The launch is scheduled April 5 (April 4, U.S. time), one week before the 50th anniversary of the launch of Yuri Gagarin from Baikonur to become the first human in space. The Soyuz TMA-21 is dubbed Gagarin in honor of that historic launch.Victor Zelentsov