I'm thinking more of modern style camouflage clothes and bullet firing guns in a fictional open world setting. I often get the idea when playing COD. It'll have to set after a post wartime where a lesser power has managed to cripple and bring down all super power and law.
I've not played the new Metal Gear solid yet which I think is modern day military with some open world.
Rage is rebels fighting against a corrupt authority which if continued could be a great universe if they could manage to stand out from being like another Fallout, Mad Max & Borderlands.