CS2D 
Modern Warfare 2D
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Take a look at the list:
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3 kills - UAV Recon: Use it and you can see the enemies at red dots on your mini radar !
4 kills - Care Package: Give you a smoke bomb, throw it and a box will appear after 5 secs. In the box, we will have full ammo/ or another killstreak.
4 kills - Counter-UAV: Disable enemies's radar.
The rewards are random ( 50% of getting CP, 50% of getting C-U)
5 kills - Predator Missile: I don't have any idea about this killstreak, maybe... controlable missile ?
5 kills - Sentry Gun: Give you a smoke bomb ( like CP), throw it and a sentry gun will appear after 5 secs ( and it's moveable)
6 kills - Precision Strike: Smoke bomb the place you want to blow, then throw it, ka-boom.
7 kills - Harrier Strike: Like Precision Strike, but bigger explosion, and bonus: after the smoke disappear, leave a mark. Any dude get close to that mark will be shot ( 1 shot = 20 hp, with firing sound). The mark will disappear after 45 secs).
7 kills - Attack Helicopter: Use it and you can have 4 random marks on the map. Just like HStr, dudes will get shot if they get close to marks :D.
8 kills - Emergency Airdrop: 4 care packages at a time !
9 kills - Pave Low: Attack Helicopter with bigger damage ( 1 shot = 50 hp), 5 marks.
9 kills - Stealth Bomber: Precision Strike with x2 range.
11 kills - Chopper gunner: Fun part, you can control a helicopter, flying around the map, shooting minigun with your left mouse, shooting a missile with right mouse, but only for 40 secs.
15 kills - EMP: The electromagnetic pulse, no more killstreak for 1 min ( except the dude use who use it).
25 kills - Tactical Nuke: 10 secs after you use it, the whole map explode, everybody die, and you win.
3 kills - UAV Recon: Use it and you can see the enemies at red dots on your mini radar ! 4 kills - Care Package: Give you a smoke bomb, throw it and a box will appear after 5 secs. In the box, we will have full ammo/ or another killstreak. 4 kills - Counter-UAV: Disable enemies's radar. The rewards are random ( 50% of getting CP, 50% of getting C-U) 5 kills - Predator Missile: I don't have any idea about this killstreak, maybe... controlable missile ? 5 kills - Sentry Gun: Give you a smoke bomb ( like CP), throw it and a sentry gun will appear after 5 secs ( and it's moveable) 6 kills - Precision Strike: Smoke bomb the place you want to blow, then throw it, ka-boom. 7 kills - Harrier Strike: Like Precision Strike, but bigger explosion, and bonus: after the smoke disappear, leave a mark. Any dude get close to that mark will be shot ( 1 shot = 20 hp, with firing sound). The mark will disappear after 45 secs). 7 kills - Attack Helicopter: Use it and you can have 4 random marks on the map. Just like HStr, dudes will get shot if they get close to marks :D. 8 kills - Emergency Airdrop: 4 care packages at a time ! 9 kills - Pave Low: Attack Helicopter with bigger damage ( 1 shot = 50 hp), 5 marks. 9 kills - Stealth Bomber: Precision Strike with x2 range. 11 kills - Chopper gunner: Fun part, you can control a helicopter, flying around the map, shooting minigun with your left mouse, shooting a missile with right mouse, but only for 40 secs. 15 kills - EMP: The electromagnetic pulse, no more killstreak for 1 min ( except the dude use who use it). 25 kills - Tactical Nuke: 10 secs after you use it, the whole map explode, everybody die, and you win.There, the whole killstreak lua. Contact me if you need more details, or questions.
Thanks for your help.
R a G e