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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!

lol you did your math wrong
sentry gun + hardline = 4
Unless you were referring to a care package which is unpredictable

yup hes right good post though

Thanks for point out my mistake
Got a bit hastey
Rep for correction thanks again

ya, you could only get 16 kills per game, and that is also assuming that you can get those done before the time limit runs out.

An easier trick to get basically all of these challenges (except sentry) is just use danger close pro. Attack helicopters would normally get 1 or 2 if not shot down. But with danger close pro im getting 4 or 5 kills. It actually makes a big difference

sentry is 5 kills + hardline makes sentry 4 kills so he was right

i know its 4 kills, ive already corrected it
dont flame plz! =x

i dont understand what your saying at all

its simple, just follow the steps

Um.. this is obvious though? Thanks for sharing anyway