Do you want to focus on military operations in foreign insurgencies, or COIN?

Movies like Ghandi or Malcolm X off the top of my head might help your crew to step back and expand their perspectives a bit. This is all about populaces under a governance they find intolerable, illegitimate, or both; who also have no legal means of redress to ragain or gain control of, or even shape their governance; so they resort to violence.

The military aspect is usually one of pipehitter for that government. Much like the goons who would be set upon workers attempting to unionize a century ago in the states.