▁duties ▁was ▁to ▁keep ▁track ▁of ▁enemy ▁prisoner ▁of ▁war ▁( P OW ) ▁cam ps ▁in ▁North ▁Korea . ▁Cor so ▁was ▁in ▁charge ▁of ▁investig ating ▁the ▁estimated ▁number ▁of ▁U . S . ▁and ▁other ▁United ▁Nations ▁P OW s ▁held ▁at ▁each ▁camp ▁and ▁their ▁treatment . ▁ ▁At ▁later ▁hear ings ▁in ▁ 1 9 9 2 ▁of ▁the ▁Senate ▁Select ▁Committee ▁on ▁P OW / MI A ▁Affairs , ▁Cor so ▁provided ▁first ▁hand ▁testim ony , ▁that ▁many ▁hundreds ▁of ▁American ▁P OW s ▁were ▁abandoned ▁at ▁these ▁cam ps . ▁ ▁At ▁those ▁hear ings , ▁Senator ▁John ▁McC ain ▁( R - A Z ) ▁dismiss ed ▁the ▁und ocument ed ▁and ▁un cor ro bor ated ▁alleg ations ▁made ▁by ▁Cor so ▁as ▁being ▁extremely ▁difficult ▁to ▁believe . ▁McC ain ▁imp lied ▁that ▁Cor so ▁was ▁guilty ▁of ▁fabric ating ▁the ▁truth ▁and ▁essentially ▁terminated ▁the ▁testim ony ▁being ▁given ▁by ▁Cor so ▁immediately ▁after ▁a ▁severe ▁ver bal ▁repr im and ▁on ▁live ▁television . ▁McC ain ▁stated ▁that ▁his ▁knowledge ▁obtained ▁from ▁those ▁who ▁had ▁personal ▁relationships ▁with ▁Eisen h ower ▁led ▁him ▁to ▁believe ▁that ▁Eisen h ower ▁was ▁just ▁not ▁capable ▁of ▁allowing ▁known ▁American ▁P OW s ▁to ▁remain ▁in car cer ated ▁after ▁the ▁term ination ▁of ▁the ▁Korean ▁War . ▁ ▁Cor so ▁was ▁on ▁the ▁staff ▁of ▁President ▁Eisen h ower ' s ▁National ▁Security ▁Council ▁for ▁four ▁years ▁( 1 9 5 3