[quote=@ClocktowerEchos]
WW1 to WW2 is a HUGE time span for weapons, it basically redefined modern warfare today. You can't just say "between ww1 and ww2" since its like a 30 year period where just about everything military changed. Organization, weapons, tactics, leadership, you name it and its been altered. 

Again, it doesn't matter if the CE has mages and stuff, the NCR has modern weapons. No amount of armor is going to stop a .50 BMG shot from Anti Material rifle or a missile from a missile launcher or a laser/plasma from an energy weapon or a grenade going off at point blank. While the NCR beat back the BoS, they weren't going at them with sticks and stones, even the Legion and Tribals have guns.

By the logic I'm getting, you're saying that basically the Fire Nation has a chance against Wolfenstien The New Order's Third Reich because the Fire Nation has magic.
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yeah... .  I guess I'm allowing too much of a time period difference then.