Search and Destroy Boosting
Class One:
First weapon: Riot Shield
Second weapon: -
Perk one: One Man Army/Pro
Perk two: Anything
Perk 3: Anything
Class Two:
First weapon: RPD
Second weapon: -
Perk one: One Man Army/Pro
Perk two: Anything
Perk 3 Anything
You can now try this as I can confirm it works as well.
Class One:
First weapon: Riot Sheild
Second weapon: -
Perk one: One Man Army/Pro
Perk two: Anything
Perk 3: Anything
Class Two:
First weapon: Akimbo P90
Second weapon: -
Perk one: One Man Army/Pro
Perk two: Anything
Perk 3 Anything
Okay, you now have them classes, this is how you boost with them.
Your partner who you are boosting with pulls out the RPD class, you will pull out the Riot Shield class.. he will shoot a whole clip from the RPD into your shield.. once his clip is empty, you will both press the 'Y' button, you will switch to the RPD class and he will switch to the Riot Shield class, then you put a whole clip into him.. then you both switch again and again and again, until the time limit is reached, this way you'll get the maximum amount of EXP, which should be around 77,000 to 90,000.
Please note that you have to be rank 45 to have One Man Army.