Hmm...man-made armaggedon?
Semi-future tech soldiers going at it between two factions: The United Western Hemisphere of Humanity (UWHH) and The Coalition of Common Survival (CCS). UWHH is heavy on capitalism, and rich to boot, which means big guns, lots of them, and plenty of warmongers ready and willing to use them. "Why think, when you can shoot" is the motto of UWHH grunts.
CCS suffers from the state of the world economy, so they've got smaller guns, but they're great on tactics. Their soldiers are more disciplined and all have a knack for infiltration and sabotage. "Cripple them from the inside" as the CCS commandos like to say.
What do you think?