▁the ▁crew ▁would ▁have ▁moved ▁into ▁the ▁International ▁Space ▁Station ▁and ▁returned ▁in ▁Russian ▁So y uz ▁caps ules , ▁one ▁at ▁a ▁time , ▁over ▁the ▁course ▁of ▁a ▁year . ▁All ▁ST S - 1 3 5 ▁crew ▁members ▁were ▁custom - f itted ▁for ▁a ▁Russian ▁S ok ol ▁space ▁suit ▁and ▁m old ed ▁So y uz ▁seat ▁l iner ▁for ▁this ▁possibility . ▁The ▁reduced ▁crew ▁size ▁also ▁allowed ▁the ▁mission ▁to ▁maxim ize ▁the ▁payload ▁carried ▁to ▁the ▁I SS . ▁It ▁was ▁the ▁only ▁time ▁that ▁a ▁Sh utt le ▁crew ▁of ▁four ▁fle w ▁to ▁the ▁I SS . ▁The ▁last ▁sh utt le ▁mission ▁to ▁fly ▁with ▁just ▁four ▁crew ▁members ▁occurred ▁ 2 8 ▁years ▁earlier : ▁ST S - 6 ▁on ▁ 4 ▁April ▁ 1 9 8 3 ▁ab o ard ▁. ▁ ▁C rew ▁se ating ▁ ▁Fund ing ▁With ▁support ▁from ▁both ▁the ▁House ▁of ▁Representatives ▁and ▁the ▁Senate , ▁the ▁fate ▁of ▁ST S - 1 3 5 ▁ultimately ▁dep ended ▁on ▁whether ▁law m akers ▁could ▁agree ▁to ▁fund ▁converting ▁the ▁mission ▁from ▁launch - on - need ▁to ▁an ▁actual ▁flight . ▁On ▁ 1 5 ▁July ▁ 2 0 1 0 , ▁a ▁Senate ▁committee ▁passed ▁the ▁ 2 0 1 0 ▁NASA ▁re author ization ▁bill , ▁author ed ▁by ▁Senator ▁Bill ▁Nelson , ▁to ▁direct ▁NASA ▁to ▁fly ▁an ▁extra ▁Space ▁Sh utt le ▁mission ▁( ST S - 1 3 5 )