Really good studies should push the horizon, enlarge the view.

A special interest in four U.S.-related conflicts (I read Vietnam and Afghanistan as such) sounds (warning: blunt) almost like failed education to me.

There's so much in military history; several continents, documented military history of up to five thousand years. Yet, U.S. officers speak of the same few conflicts most of the time; those that their nation was involved in.

Here are some alternative topics (no, I don't think that anyone here will take these examples seriously):

Cannae and its effect on the art of war

Leuthen and its effect on the art of war

Coining war experiences of the Chinese society

The historical influence of logistics technology on the culminating point of attack

Successful reforms of mature armies to meet new strategic needs (since the 16th century)

The Wars of the East India Companies and the Hanse (trade NGOs)

Successful historical control of terrain with very low force densities