▁While ▁here ▁appreci ating ▁the ▁C IA ▁reports ▁Hel ms ▁supplied ▁him ▁on ▁China , ▁N ixon ▁non eth eless ▁kept ▁his ▁diplom atic ▁travel ▁prepar ations ▁within ▁the ▁White ▁House ▁and ▁under ▁wra ps . ▁To ▁prepare ▁for ▁N ixon ' s ▁ 1 9 7 2 ▁trip ▁to ▁China , ▁K iss inger ▁ordered ▁that ▁C IA ▁cover t ▁operations ▁there , ▁including ▁Tib et , ▁come ▁to ▁a ▁halt . ▁ ▁In ▁the ▁meant ime , ▁Vietnam ization ▁sign ified ▁the ▁withdraw al ▁of ▁American ▁troops ▁from ▁Vietnam , ▁while ▁the ▁br unt ▁of ▁the ▁fighting ▁was ▁shift ed ▁to ▁South ▁Vietnam ese ▁armed ▁forces . ▁This ▁affected ▁all ▁C IA ▁operations ▁across ▁the ▁political - mil it ary ▁landscape . ▁According ly , ▁D CI ▁Hel ms ▁w ound ▁down ▁many ▁C IA ▁activities , ▁e . g ., ▁civ ic ▁projects ▁and ▁par amil it ary ▁operations ▁in ▁Vietnam , ▁and ▁the ▁" secret ▁war " ▁in ▁La os . ▁The ▁Phoenix ▁program ▁once ▁under ▁Col by ▁( 1 9 6 7 – 1 9 7 1 ) ▁was ▁also ▁turned ▁over ▁to ▁Vietnam ese ▁direction ▁and ▁control . ▁The ▁ 1 9 7 3 ▁Paris ▁Peace ▁Acc ords , ▁however , ▁came ▁after ▁Hel ms ▁had ▁left ▁the ▁C IA . ▁ ▁To ▁sust ain ▁the ▁existence ▁of ▁the ▁South ▁Vietnam ▁regime , ▁N ixon ▁mass ively ▁increased ▁American ▁military ▁aid . ▁Yet ▁in ▁ 1 9 7 5 ▁the ▁regime ' s ▁army ▁quickly ▁col lapsed