The Vietnam Template: War College Fellow Mac Owens takes on the Iraq/Vietnam comparison:

The anti-Coalition forces can harass the U.S. forces and inflict casualties, but they cannot prevail unless we permit them to. But we do need to acknowledge what is happening there and to modify our approach. In Iraq, we need to isolate the Baathist regions . . . But we also have to secure the borders between Iraq and its neighbors, especially Iran and Syria. These countries need to understand that they will pay dearly for supporting the jihadists that cross their borders into Iraq. Those who believe this is a diplomatic issue need to recall the observation of Frederick the Great: "Diplomacy without force is like music without instruments."

No, Iraq is not Vietnam. In fact, he goes on to say, Vietnam wasn't even Vietnam.