Right up to the point when one of the sick bastards puts a gun to your head and pulls the trigger.
There is no Afghanistan; there is only a collection of tribes.
So pick one tribe — the roughest of the bunch — and hire them. Give them all the benefits. They support your interests (because their leaders are getting billions for their Swiss bank accounts, and their followers are getting
all the good things money can buy).
They will be loyal as long as the paychecks keep coming.
But never believe that they are on your side; they are on their side, only.