▁expand ▁the ▁capabilities ▁of ▁the ▁T itan ▁launch ▁vehicles ▁for ▁its ▁heavy ▁lift ▁capabilities . ▁The ▁Air ▁Force ▁constructed ▁La unch ▁Comple xes ▁ 4 0 ▁and ▁ 4 1 ▁to ▁launch ▁T itan ▁III ▁and ▁T itan ▁IV ▁rock ets ▁just ▁south ▁of ▁Kennedy ▁Space ▁Center . ▁A ▁T itan ▁III ▁has ▁about ▁the ▁same ▁payload ▁capacity ▁as ▁the ▁Sat urn ▁IB ▁at ▁a ▁considerable ▁cost ▁sav ings . ▁ ▁La unch ▁Complex ▁ 4 0 ▁and ▁ 4 1 ▁have ▁been ▁used ▁to ▁launch ▁defense ▁reconna issance , ▁communic ations ▁and ▁weather ▁sat ell ites ▁and ▁NASA ▁planet ary ▁miss ions . ▁The ▁Air ▁Force ▁also ▁planned ▁to ▁launch ▁two ▁Air ▁Force ▁man ned ▁space ▁projects ▁from ▁L C ▁ 4 0 ▁and ▁ 4 1 . ▁They ▁were ▁the ▁D yna - So ar , ▁a ▁man ned ▁orb ital ▁ro cket ▁plane ▁( c ance led ▁in ▁ 1 9 6 3 ) ▁and ▁the ▁US AF ▁Mann ed ▁Or b ital ▁Labor atory ▁( M OL ), ▁a ▁man ned ▁reconna issance ▁space ▁station ▁( c ance led ▁in ▁ 1 9 6 9 ). ▁ ▁From ▁ 1 9 7 4 – 1 9 7 7 ▁the ▁powerful ▁T itan - C enta ur ▁became ▁the ▁new ▁heavy ▁lift ▁vehicle ▁for ▁NASA , ▁launch ing ▁the ▁Vik ing ▁and ▁Vo y ager ▁series ▁of ▁space craft ▁from ▁La unch ▁Complex ▁ 4 1 . ▁Complex ▁ 4 1 ▁later ▁became ▁the ▁launch ▁site ▁for ▁the ▁most ▁powerful