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.
You should be more specific.
The highest kill streak award you can get is a chopper. Requires 7 kills with out dying.
The highest kill streak is unlimited, because in domination their is no time limit.
The highest killstreak available at a 7 kill streak is the Attack Helicopter, which flies around the map for 1 minute, shooting down any members of the opposing team in sight.
Your question is a bit of a awkward question as what do you mean the most kills: E.g Highest killstreak, amount of kills in 1 game ETC ETC
992kills and 12 deaths
256 and 29 assits
NUKE!!!
The best killstreak is the Tactical Nuke but use killstreaks that you can get frequently.
Get 47 killstreak on call of duty modern warfare three
Kill 10 enemies with a single killstreak reward
The emergency airdrop killstreak is unlocked at 8 kills.
you can unlock it with you're first killstreak award unlock
by killing someone with a ten or more killstreak that's for the emblem
Kill an enemy just before they earn a 10 or higher killstreak
You can't. That is the only killstreak you can't get from a care package.
The answer to that would be no. If you have a killlstreak when a game ends, the next match your killsreak will strat over. However, your killstreak will be recorded in the barracks and under the leaderboards.
To get UAV on multiplayer, you must get a 3-killstreak and press right on the directional pad.
by equiping the killstreak and getting 25 kills (24 if you use hardline) without dying