A REAL TERMINATOR

We don't need to worry about SkyNet, we need to worry about Navy and General Dynamics.  This unit of the government developed a robot that patrols The Nevada National Security Site, which houses low-levels of radioactive waste (tens of millions of cubic feet) and a destination for tests on thousands of Cold War nuclear weapons.

These first generational equivalents of T-3s and T-1000 are named  Mobile Detection Assessment Response Systems or MDARS for short.

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.

via wired