The US Army is now trying out remote-controlled weaponized towers to take the place of soldiers who are assigned to protect the perimeter. The containerized weapons system is designed to be transportable and easily assembled by a small group of soldiers in under an hour. The weapons are then controlled by a remote team that determines when they should fire. The advanced system is even capable of identifying targets and automatically determining if they are friend or foe.
The soldiers that were originally assigned to do the job can now be deployed in support missions and conduct work within the safe confines of the base. While this system still requires human intervention to fire, it's clear that autonomous weapons are on the horizon.