Give me a group of West Point Grads and I'll win the battle. Give me a bunch of Texas A&M Aggies and I win the war. G.S. Patton... VMI & West Point... or at least close to what he said.
The most informative book you'll ever read...
Encyclopedia of Souther Culture.
Edited by Wilson & Ferris
Published by Chapel Hill
Quite remarkable!
Thanks, I'm partial to A&M myself (my in-laws all went there).
If you want to get TRULY ethnographic about which group of people have disproportionately served in the military, you can easily identify the descendents of Scots-Irish from Appalachia, the deep south and the lower Midwest.