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set scr_allow_killstreak_building "1"
Make killstreak kills count as regular kills to earn other killstreaks.
For example, if you have 4 normal kills (shooting, grenade, claymore, melee..) and you need 3 more for Attack Helicopter, Then you deploy Napalm Strike and kill 3 players with it, you'll earn Attack Helicopter
Also..
set scr_game_killstreaks "0"
Disable Killstreaks

(Sry for bad english)