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Sentry Gun
Harrier
Pave Low
Attack Helicopter
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Step 1. Set your killstreak to desired Challenge
Step 2. Go into Cage Match or Domination/Free For All (with friend)
Step 3. Get kills (use hardline) that you need for killstreak
Step 4. Partner dies to it (ALOT)
Step 5. Enjoy the title

Example -
Say i want Gold Skull Sentry Gun title

Step 1. Set killstreak to Sentry Gun and use Hardline
Step 2. Enter Free For All (i like it better than Cage Match)
Step 3. Shoot partner 4 times
Step 4. Call Sentry Gun (AWAY from everyone else)
Step 5. Repeat Step 2-5 Untill obtaining 1000 Kills

~ Some Math ~
Gold Skull title - 1000 kills
Sentry Gun = 4 Kills (with hardline)
20 - 4 = 16
16 Sentry Gun Kills per game
1000 / 16 = 62.5 (or 63)
^ Is how many games youll be playing (63)
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Also!
16x63= 1008
Your getting +1008 Kills and >>0<< Deaths!
MEGA!!! KDR Boost (about .5-.6 [depending on your kills/deaths])
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Hope this helped! If so please Rep/Thanks/Nominate!

...im off to go do this laters!

not everyone thinks of the obvious, i ran across this usefull tip (by myself) and thought i might share

ive learned a whole lot from this website, thought i might share some info

I know, I wasnt ranting or anything, just stated it was obvious ^

double post <3

This seems like it would take a long time, but it's more kills then you would get with it in a game. I have done this with a friend recently, just so i could master some of my guns. but i never would have thought of killstreaks. nice post. I'll +rep.

thanks glad it was found usefull

so pretty much instead of headshots in cage match.

you would do ac130 kills?

So your saying i can killstreak boost AND do challenges? Who ever though of this?!?! GENIUS!!!!

This would be more appropriate in Discussion or Rank Up Discussion IMO but I believe getting the helicopter kills would be faster in Ground War if you have a dummy your using for the kills. As for the sentries this might be faster since they can be a bust sometimes

Seems pretty obvious to me, but evidently not to others.