I thought a dead simple military application would be sentries. Have them patrolling around FOBs, return and charge when they need to, fresh ones go out. Unarmed of course.
The grandparent said autonomous armed robots that are currently in use (which excludes under development).
As far as we know, the answer to that question is zero, unless you might count a missile as an autonomous flying robot (but even that still has to be launched by human).
I like Black Mirror. Like an extension of the argument that "guns don't shoot people, people shoot people", Black Mirror displays the equation, XYZcoolTech+people = horrifying.
Apply that here and you can bet that "florida robot dog does stupid thing" will be a headline in the future.
I admire your optimism!