Red cross/crescent for starters.
Then we got PoW treatment, the requirements of uniform, interference by non-interested parties to prevent human suffering (bosnian war and shitting on the bosnian serbs), anything related to non-related countries citizens caught in the war zone.
And let's not forget how looting, raiding and pillaging is practically non-existant in modern war. (Yes, I know rebels/guerrillas still loot&raid, but going from "every soldier, everywhere, ever loots, at any possible opportunity" to "certain small, underfunded and desperate groups does it, when they can" is a fucking gigantic change)