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Call of Duty 4 had some questionable design decisions as far as killstreaks and perks are concerned.
In my opinion, The helicopter was just unbalanced and the martyrdom perk rewarded people for dying.
It pales to what is clearly the worst design decision ever.
One of the newest leaked kill rewards is the Tactical Nuke, which you can get after a Killstreak of 25 kills.
So what happens once the nuke goes off? The game ends. The team which used the nuke wins.
Considering you have much more killstreak options now, getting to 25 is now even easier.