If you have 3 Friends you can do the Extra Ops 128 - Gear REX.
We got about 2000 Camaraderie in 10mins.
Means 10x Gear REX, about 2hrs for 20.000 Camaraderie!
Make sure you put him to sleep and got S Rank.
Do NOT use BattleCrys,StealthCamo or anything else that
decrease your Rank.
Recommended equipment:
- Mk22 Rank 4-5
- Mosin-Nagant Rank 4
- Decoy (ExtraOps 53,Truck)
- SleepGasGrenade Rank 4-5 (ExtraOps 27, S Rank)
- Infinity Bandana (ExtraOps 119, S Rank)
- Rescue Box Rank 4-5
Always stay in the Coop-Circle but not to close to each other, cause G.R. can down you in one hit.
Use the Decoys to distract Gear REX from your Teammates,
you also can use the StunRod three times to Stun him for a short
while and throw SleepGasGrenades next to REX.
Edit:
Note from slipknot974:
"its possible to lose camaraderie by playing with too many
random people. The game only records the last 50 people
you've played with. If you play with more then 50 people the
game will start pushing the latest name on its memory off and
erasing all the camaraderie you had with that play."
Yes, thats right, lost some Points too by playing with
to many different people.