You can continue to repeat your mantra about the "official policy" all you want...but you've STILL not shown where Kennedy's "official policy" to prevent the spread of communism changed. If it hadn't changed? Then there is no way that Kennedy is walking away from Vietnam and the rest of Southeast Asia at the height of the Cold War! I'm sorry but that simply wasn't going to happen...hence Saunder's belief that Kennedy wouldn't have withdrawn troops.