btw, you can set all to 1 (ive tried to zero, but aint workin ) and when you pickup one dogtag you have all the 3 killstreak
try this out
C:\Program Files (x86)\Electronic Arts\Crytek\Crysis 2\gamecrysis2\Scripts\PerkInfo\ScoreRewards.xml
Code:
<RewardTable>
<Level name="Wars/cw2_rooftop_gardens" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="AlienGunship" />
<Level name="Wars/cw2_alien_vessel" perk1="TeamSuperRadar" perk2="SuitDisruptor" perk3="AlienGunship" />
<Level name="Wars/cw2_alien_vessel_small" perk1="TeamSuperRadar" perk2="TeamRadarJammer" perk3="TeamSuitBoost" />
<Level name="Wars/cw2_church" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="TeamSuitBoost" />
<Level name="Wars/cw2_city_hall" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="TeamSuitBoost" />
<Level name="Wars/cw2_collided_buildings" perk1="TeamSuperRadar" perk2="TeamRadarJammer" perk3="TeamSuitBoost" />
<Level name="Wars/cw2_cxp_liberty" perk1="TeamSuperRadar" perk2="SuitDisruptor" perk3="AlienGunship" />
<Level name="Wars/cw2_cxp_liberty_mil" perk1="TeamSuperRadar" perk2="SuitDisruptor" perk3="AlienGunship" />
<Level name="Wars/cw2_cxp_liberty_statue" perk1="TeamSuperRadar" perk2="SuitDisruptor" perk3="AlienGunship" />
<Level name="Wars/cw2_downtown" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="TeamSuitBoost" />
<Level name="Wars/cw2_lighthouse" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="AlienGunship" />
<Level name="Wars/cw2_pier" perk1="TeamSuperRadar" perk2="MicrowaveBeam" perk3="AlienGunship" />
<Level name="Wars/cw2_terminal" perk1="TeamSuperRadar" perk2="TeamRadarJammer" perk3="TeamSuitBoost" />
<Reward dogtags="1" givePerk="TeamSuperRadar" />
<Reward dogtags="1" givePerk="TeamRadarJammer" />
<Reward dogtags="1" givePerk="SuitDisruptor" />
<Reward dogtags="1" givePerk="MicrowaveBeam" />
<Reward dogtags="1" givePerk="AlienGunship" />
<Reward dogtags="1" givePerk="TeamSuitBoost" />
</RewardTable>