▁to ▁believe ▁that ▁if ▁such ▁a ▁study ▁of ▁Hitler ▁had ▁been ▁made ▁years ▁earlier , ▁under ▁less ▁t ension , ▁and ▁with ▁more ▁opportunity ▁to ▁gather ▁first - hand ▁information , ▁there ▁might ▁not ▁have ▁been ▁a ▁Mun ich ; ▁a ▁similar ▁study ▁of ▁St alin ▁might ▁have ▁produced ▁a ▁different ▁Y al ta ; ▁one ▁of ▁Castro ▁might ▁have ▁prevent ed ▁the ▁Cub an ▁situation ; ▁and ▁one ▁of ▁President ▁D iem ▁might ▁have ▁avoided ▁our ▁deep ▁invol vement ▁in ▁Vietnam . ▁Studies ▁of ▁this ▁type ▁cannot ▁solve ▁our ▁international ▁problems . ▁That ▁would ▁be ▁too ▁much ▁to ▁expect . ▁They ▁might , ▁however , ▁help ▁to ▁avoid ▁some ▁of ▁the ▁serious ▁bl und ers ▁we ▁seemed ▁to ▁have ▁made ▁because ▁we ▁were ▁ignor ant ▁of ▁the ▁psych ological ▁factors ▁involved ▁and ▁the ▁nature ▁of ▁the ▁leaders ▁with ▁whom ▁we ▁were ▁negoti ating .” ▁ ▁Following ▁the ▁L anger ▁profile , ▁US ▁pres idents ▁began ▁request ing ▁profiles ▁of ▁foreign ▁diplom ats ▁before ▁important ▁events ▁and ▁meet ings . ▁Not ably , ▁John ▁F . ▁Kennedy ▁requested ▁a ▁profile ▁of ▁Soviet ▁Premier ▁Nik ita ▁K hr ush chev ▁as ▁part ▁of ▁his ▁prepar ation ▁for ▁the ▁ 1 9 6 1 ▁Vienna ▁Sum mit , ▁and ▁President ▁Richard ▁N ixon ▁asked ▁the ▁Central ▁Int elligence ▁Agency ▁( CI A ) ▁for ▁profiles ▁of ▁both ▁Ma o ▁Z ed ong ▁and ▁Ch ou ▁En la i ▁before ▁emb ark ing ▁on ▁his ▁first ▁visit ▁to ▁China . ▁▁▁ <0x09> ▁From ▁ 1 9