Zawahiri later returned to this theme, declaring that the Americans "know better than others that there is no hope in victory. The Vietnam specter is closing every outlet." Here at home, some can argue our withdrawal from Vietnam carried no price to American credibility -- but the terrorists see it differently.
We must remember the words of the enemy. We must listen to what they say. Bin Laden has declared that "the war [in Iraq] is for you or us to win. If we win it, it means your disgrace and defeat forever." Iraq is one of several fronts in the war on terror -- but it's the central front -- it's the central front for the enemy that attacked us and wants to attack us again.
Unlike in Vietnam, if we withdraw before the job is done, this enemy will follow us home. And that is why, for the security of the United States of America, we must defeat them overseas so we do not face them in the United States of America.