Currently the MDARS [Mobile Detection Assessment Response Systems] are patrolling The Nevada National Security Site autonomously. This site is "home to tens of millions of cubic feet of low-level radioactive wast -- and location of over a thousand Cold War nuclear weapons test."
The first of a planned trio of Mobile Detection Assessment Response Systems, or MDARS, is currently patrolling some of the more remote sections of the 1,360 square mile facility. The camera-equipped MDARS can scoot around pre-determined paths on its own, alerting flesh-and-blood guards when it encounters an intruder or a broken lock. In development by the Navy and General Dynamics since the early 1990s, the diesel-fueled sentry bot can operate for up to 16 hours, and reach a top speed of 20 mph. The U.S. military has experimented with using the MDARS machines to patrol some of its Hawthorne Army Depot in Nevada. The bots have even been tested with automatic weapons -- though I doubt that's the plan at the nuke site....That sounds like a great idea, let's equip this Autonomous Robot with 'automatic weapons'....what could possibly go wrong...?! I don't know about you, but I'm going to watch all the Terminator movies tonight for research...and then hide in my basement.