▁It ▁used ▁the ▁orb iter ▁Atl ant is ▁and ▁hardware ▁originally ▁processed ▁for ▁the ▁ST S - 3 3 5 ▁cont ing ency ▁mission , ▁which ▁was ▁not ▁flow n . ▁ST S - 1 3 5 ▁launched ▁on ▁ 8 ▁July ▁ 2 0 1 1 , ▁and ▁land ed ▁on ▁ 2 1 ▁July ▁ 2 0 1 1 , ▁following ▁a ▁one - day ▁mission ▁extension . ▁The ▁four - person ▁crew ▁was ▁the ▁smallest ▁of ▁any ▁sh utt le ▁mission ▁since ▁ST S - 6 ▁in ▁April ▁ 1 9 8 3 . ▁The ▁mission ' s ▁primary ▁cargo ▁was ▁the ▁Multi - P ur pose ▁Log istics ▁Module ▁( MP LM ) ▁R aff a ello ▁and ▁a ▁Light weight ▁Multi - P ur pose ▁Car rier ▁( L MC ), ▁which ▁were ▁delivered ▁to ▁the ▁International ▁Space ▁Station ▁( I SS ). ▁The ▁flight ▁of ▁R aff a ello ▁marked ▁the ▁only ▁time ▁that ▁Atl ant is ▁carried ▁an ▁M PL M . ▁ ▁Although ▁the ▁mission ▁was ▁author ized , ▁it ▁initially ▁had ▁no ▁appropri ation ▁in ▁the ▁NASA ▁budget , ▁raising ▁questions ▁about ▁whether ▁the ▁mission ▁would ▁fly . ▁On ▁ 2 0 ▁January ▁ 2 0 1 1 , ▁program ▁man agers ▁changed ▁ST S - 3 3 5 ▁to ▁ST S - 1 3 5 ▁on ▁the ▁flight ▁manifest . ▁This ▁allowed ▁for ▁training ▁and ▁other ▁mission ▁specific ▁prepar ations . ▁On ▁ 1 3 ▁February ▁ 2 0 1 1 , ▁program