harrier ac130 and nuke
kill heaps of enemy killstreaks
Chopper Gunner, Predator Missle, Harrier Airstrike.
Killstreaks in MW2 are tools, such as Predator Missiles, that can help you eliminate your enemies easily. If you have a Killstreak but you are killed, you will have to start the streak again but you will keep any killstreaks unlocked.
UAV, Airstrike, Helicopter (not drivable, it just flys around the map)
More guns. It continues the storyline from modern warfare 2. For multiplayer, there will be more perks and killstreaks and weapons. Also for multiplayer there will be more maps.
Modern Warfare 2 by default has no golden guns, unlike it's predecessor.
The best killstreak is the Tactical Nuke but use killstreaks that you can get frequently.
so far it is unown, but i heard there wil be a helecopter version of the RC car
It is set as medium, which is at 2.
The yellow bar is how many kills you got towards your kill streaks.
You mean the Infinity Ward emblem? Complete the "Wargasm" challenge by getting all of your killstreaks within 20 seconds. Quite easy with Hardline and the lowest killstreaks.