Before they were famous!

Rather astonishingly, Sagan (1994) cites David H. Petraeus, "The American Military and the Lessons of Vietnam: A Study of Military Influence and the Use of Force in the Post-Vietnam Era", (Ph.D. diss., Princeton University, 1987).

Article available here.

Postscript: On the next page, Sagan writes:

[T]he military, like most organizations, tends to plan incrementally, leading it to focus on immediate plans for war and not the subsequent problems of managing the postwar world. Moreover, since managing the postwar world is the diplomats' job, not part of military officers' operational responsibility, the professional military is likely to be short-sighted, not examining the long-term political and diplomatic consequences of preventive war.