he is one reason why the space shuttles were retired in 2011 after the station was completed.The goal is to have SpaceX and other private firms take over the job of ferrying astronauts to and from the space station in the next few years.SpaceX -- so far the leader of the pack -- is aiming for a manned Dragon flight by 2015.Go Falcon 9, go Dragon, Garver urged before the launch.This is the secon