The highest killstreak would be the amount of kills you can get on that match
The highest kill streak in halo is a perfection/invincible.
Attack Dogs - 11 Kills
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Attack Dogs and the Gunship are both the highest killstreak reward at 11 kills.
25
you can't :(
hitlers kill streak is atually 17,999,998
A "Kill Joy" is a medal is received after killing someone that is on a killstreak. A killstreak is consecutive kills without dying. It is always satisfying to know you killed someone that is having a good time :)
The highest rank in Halo: Reach is Inheritor.
11 killstreaks: attack dogs or gunship
The joint highest killstreaks are helicopter Gunship and Attack Dogs both on 11 kills.
It is 11 it is either attack dogs or a gunship
Get a 100 killstreak
Well, in CoD4 killstreak rewards end with a helicopter after 7 kills. The highest scored by a person ever, I do not know. It is hard to tell as many players glitch, hack or cheat the game and therefore you cannot use their numbers as a basis for information. My highest killstreak is 27, and it stopped there because the game ended. I was 27-0 with the potential to keep going, so it is tough to say what the highest killstreaks are. But there are people with 40-50 killstreaks.
The highest possible rank in Halo: Reach is Inheritor (20,000,000 cR) but the highest rank with Grades is General which has FOUR grades (grades are credit milestones which are included with all ranks up to General).