Is there any place in Afghanistan that isn't swept by American radar? Can you land something the size and complexity of a 777 on an unimproved runway, as if it were a Cessna? Where are you going the get the facilities to service a 777? Remember a large airplane is not like a car, where you can just turn of the ignition, come back to it a week later, and expect it to perform normally. I needs continuous maintenance by skilled professionals with fancy equipment, something you're unlikely to find in Afghanistan or Somalia.