Most here in the US see Nam as a history lesson, one that is being repeated in Afghanistan.
Images affecting memory? Well of course there is some since memory fades and audio/visual recordings don't. Nam was the first war that a minority group was able to pressure politicians into a policy change of great magnitude and defeat the industrial complex and the never ending war for industry.
Afghanistan is nothing like Viet Nam. There is no war against Afghanistan. The war is against fundamentalist islam. Afghanistan is merely a theater in that war. As is New York or any other US city. As is every aircraft. If we are still comparing Afghanistan or Iraq to Viet Nam, I have to agree with Al Quaeda. We didn't learn our lessons. The embassy bombings didn't teach us. Nor either the 1993 or 2001 attacks in New York. Bombing the Cole failed to instruct. The torture of our people in Libya didn't work. Al Quaeda must think we are either the hardest headed people in the world or the most easily deluded. Maybe Iran is right it would take a nuclear bomb. That might not even work.