▁of ▁al lies ▁and ▁the ▁loss ▁of ▁a ▁pre cious ▁cold - war ▁opportunity . ▁Wis ner ▁left ▁in ▁ 1 9 5 8 . ▁Pass ing ▁over ▁Hel ms , ▁D CI ▁D ul les ▁appointed ▁his ▁rival ▁Richard ▁B iss ell ▁as ▁the ▁new ▁D DP , ▁who ▁had ▁managed ▁the ▁U - 2 ▁sp y ▁plane . ▁ ▁During ▁the ▁Kennedy ▁presiden cy , ▁D ul les ▁selected ▁Hel ms ▁to ▁test ify ▁before ▁Congress ▁on ▁Soviet - made ▁for ger ies . ▁Following ▁the ▁ 1 9 6 1 ▁Bay ▁of ▁P igs ▁f ias co , ▁President ▁Kennedy ▁appointed ▁John ▁McC one ▁as ▁the ▁new ▁D CI , ▁and ▁Hel ms ▁then ▁became ▁the ▁D DP . ▁Hel ms ▁was ▁assigned ▁to ▁manage ▁the ▁C IA ' s ▁role ▁in ▁Kennedy ' s ▁multi - ag ency ▁effort ▁to ▁dis l odge ▁Castro . ▁During ▁the ▁Cub an ▁Miss ile ▁Cris is , ▁while ▁McC one ▁sat ▁with ▁the ▁president ▁and ▁his ▁cabinet ▁at ▁the ▁White ▁House , ▁Hel ms ▁in ▁the ▁background ▁supported ▁McC one ' s ▁significant ▁contributions ▁to ▁the ▁strateg ic ▁discuss ions . ▁After ▁the ▁ 1 9 6 3 ▁coup ▁in ▁South ▁Vietnam , ▁Hel ms ▁was ▁priv y ▁to ▁Kennedy ' s ▁an gu ish ▁over ▁the ▁killing ▁of ▁President ▁D iem . ▁A ▁month ▁later ▁Kennedy ▁was ▁assass in ated . ▁Hel ms ▁eventually ▁worked ▁to ▁manage ▁the ▁C IA ' s ▁complicated ▁response ▁during ▁its ▁subsequent ▁investigation ▁by ▁the ▁Warren