First off, attack rabbits for the win. (Ever play Bunny Invasion? Damn bunnies are unstoppable! Anyways, look it up on the search bar of this webpage. Great flash game)
Second, kill streak rewards or battle support options could be very cool.
Orbital strikes
Artillery bombardments
Ship strafes
Reinforcements (idk, allied AIs?)
Supplies
Stuff
Yeah, cool idea ApexX
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Totally agree with you but instead of kill streaks how about perks like unlocked some how cause kill streaks on a campaign that's kind of outrageous.