We already have automatic ground turrets that use heat signatures and computer vision http://singularityhub.com/2010/07/25/armed-robots-deployed-by-south-korea

We already have automatic ground turrets that use heat signatures and computer vision http://singularityhub.com/2010/07/25/armed-robots-deployed-by-south-korea-in-demilitarized-zone-on-trial-basis/ http://singularityhub.com/2010/07/25/armed-robots-deployed-b... But at the end of the day, everything loses against a single nuclear bomb.