Colonel Prouty maintains that the latter memo was prepared PRIOR to JFK being whacked.
I have been able to dig from my records a most important and fascinating collection of copies of the McGeorge Bundy drafts of what became NSAM 273, dated Nov. 21, Nov. 24, and Nov. 26. The Draft coding indicates that Mac Bundy sent copies to no less than 9 key Kennedy people. In the process it was modified several times by various other offices; and the Final, Nov. 26th, LBJ copy is very different from the original JFK draft by Mac Bundy.
JFK's NSAM 263 began the withdrawal to be complete by the 64 election, but the whole plan was to be concealed. The day after his burial NSAM 273 reflects an earlier draft dated 21 Nov 63.
11/21/63
DRAFT
TOP SECRET
NATIONAL SECURITY ACTION MEMORANDUM NO.
LBJ didn't do any clandestine withdrawal by the 64 election--he was running against my guy, Barry Goldwater, hence had to appear tough.
LBJ Nov 65 refused the joint chiefs' request to bomb Hanoi and mine Haiphong, handcuffing the military to defeatist political meddling.