Russian engineers mate the Soyuz TMA-04M spacecraft and with it's boosters on May 12, 2012 at the Baikonur Cosmodrome in Kazakhstan. The launch of the Soyuz spacecraft with Expedition 31 Soyuz Commander Gennady Padalka and Flight Engineer Sergei Revin of Russia, and prime NASA Flight Engineer Joe Acaba is scheduled for 9:01 a.m. local time on Tuesday, May 15. UPI/Victor Zelentsov/NASA