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Killstreaks
3: UAV
4: Care Package
5: Predator Missile
Hardcore:
Why? Because for hardcore there is no map and a UAV is extremely helpful.
Care package is useful because the enemy can't see the care package on the map, so they wont rush to it.
And Predator Missile because you can see the enemy and kill multiple enemies possibly.
Sn
UAV: To see the enemy, since you don't respawn, you want to know where the enemy is.
Care Package: You don't get many kills, so go for the low killstreaks, you never know how lucky you may get.
Predator Missile: Easily kill 1-3 enemies at a time, useful to use on last person alive.
Hope this helped some of you newer players out there