Be creative here there are no wrong ideas.
I would like the Spartan laser to be a weapon personally, just called something different "Charge Rifle" was a name I had in mind
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Based on the game and the future date setting they probably wont do a bow and arrow, but they might consider a cross bow style weapon. Personally id like to be able to drop a support module, remote control something or call for back up. i.e. call in an air strike or a gun turret (user controlled or auto) or drone that could either heal you & attack enemies etc