Best way to kill rebel camps?

A good basic set up for tackling the world enemies is a formation of fighters, vehicles and shooters. But any troops that you have will be ok if you have enough power. You can se the combat power in the APC list to the left of each APC. If it exceed the power of the enemy then you will be ok.

If you have any buildings or buffs active that give buffs to a troop type or higher level troops of one type or a buff for having all of the same troops in a formation active then use those. You can try out different setups to see if the power changes for the better.

Recruiting better heroes and unlocking their skills will give you a much better chance of attacking higher level enemies.