After offloading of the Centaur upper stage from a Russian cargo plane, the Antenov 124, workers check the offloading of an Atlas IIA rocket. The combined Atlas IIA/Centaur will be used to launch the latest Tracking and Data Relay Satellite (TDRS) June 29 from Cape Canaveral Air Force Station. Atlas IIA is capable of lifting payload systems weights in the 2,850 kg (6,300 lb) to 3,070 kg (6,760 lb) class to geosynchronous transfer orbit