Ding

Right answer:

The U.S. has probably not yet fully woken up to the appalling fact that, after a long period in which the first motto of its military was "no more Vietnams," it faces another Vietnam. There are many important differences, but the basic result is similar: The mightiest military in the world fails to achieve its strategic goals and is, in the end, politically defeated by an economically and technologically inferior adversary.

via Atrios.