A few thoughts to make it different:
* less emphasis on weapon mods
* radiation tracking - but only displayed when you check your Geiger counter
* chemical contamination - NBC suits can be worn but limiting visibility, slowing tasks like reloading, etc
* tracer rounds
* no heads up ammo counter
* NPC allies who can be given simple instructions (probably based around hand signals) - these can be grouped or ordered individually
* more emphasis on single player storey mode than multi player
* maybe the campaign could be based on Going Home with time restraints
* oddly less combat and more story
* early choices have impacts later
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