Killstreaks

Three kills in a row = Radar. You and your team can see the enemy even when they are not shooting at anyone.

Five kills in a row = Airstrike. You can bring in a airstrike on the location of your choice.

Seven kills in a row = Helicopter. You can bring in a helicopter equipped with rockets and heavy front mounted machine gun.

Getting a killstreak is the act of killing players on the other team in succession without dying. it is a difficult thing to manage to survive kill after kill. Sometimes you get shot from behind. Sometimes you get sniped. Sometimes you simply get outgunned in a one-on-one fight.

All killstreak rewards have to be activated manually. This means you do not have to use them right away. You may find it better to hold onto radar for the next round or wait for the enemy to be clumped up in one area before calling in an airstrike. Also if you wait to bring in a airstrike or helicopter till you respawn the kills from a airstrike or helicopter will be added to the kills you are getting on your own to start the killstreak process all over again to be able to get radar, airstikes, and helicopters.