STS-121
The main purposes of the mission were to test new safety and repair techniques introduced following the "Columbia" disaster of February 2003 as well as to deliver supplies , equipment and German European Space Agency ( ESA ) astronaut Thomas Reiter to the ISS . 
<triplet> "Columbia" disaster <subj> February 2003 <obj> point in time <triplet> Thomas Reiter <subj> European Space Agency <obj> employer