NEW : Engineers Mike Fossum and Ronald Garan begin excursion . The excursion was Fossum 's seventh spacewalk and Garan 's fourth , according to a NASA statement . The crew of the International Space Station (ISS) has been busy preparing for a spacewalk on Friday to replace one of two faulty solar arrays that failed during last week's launch from Kazakhstan. : Garan : ` ` Welcome back to our other office '' The Atlantis crew is delivering supplies and spare parts . The mission is the last of the 30-year space shuttle program .
NEW : Engineers Mike Fossum and Ronald Garan begin excursion . The crew of the International Space Station (ISS) has been busy preparing for a spacewalk on Friday to replace one of two faulty solar arrays that failed during last week's launch from Kazakhstan. : Garan : ` ` Welcome back to our other office '' The Atlantis crew is delivering supplies and spare parts . The mission is the last of the 30-year space shuttle program .