Many military robots are purely remote controlled, but many others integrate often substantial levels of autonomy. Most UAVs provide autonomous navigation and stationkeeping, for example, and often much more; other military robots operate with no human in the loop whatsoever (eg, AUVs).
It's also interesting to consider the autonomy of fast-react weapons-in-the-loop systems such as AA/SAM sites and ABM installations (eg, Patriot), and the contribution of that autonomy to associated friendly-fire incidents. Methods normally considered AI---probabilistic filters, reasoning, and data fusion, in particular---are fundamental to such systems.
Also, every unmanned spacecraft ever has been controlled by an AI. These drones show the success of AI research.