You obviously A) have a strange definition of “base”, and B) don’t know we exercise no sovereignty over other countries.
We do, however, take pro-active steps to protect our interests. We don’t have the Founder’s luxury of hiding behind two oceans...
We don’t exercise sovereignty? Karzai couldn’t pour piss out of a boot if the instructions were written on the heal. We run that place (along with the Taliban) lock, stock, and barrel. Why is my definition of base strange?