High risk ground jobs are already being taken on by unmanned ground vehicles. Witness the myriad EOD robots, as well as the prototypes of weapons-toting robots and automated trucks. Someday most of the vehicles in a convoy will be automated. The problems right now are that it's easier to build a robot to travel in the air than the ground, you'd have to replace thousands of infantry vice hundreds of planes, and the fact that robots can't talk effectively to the local populace (yes, they can have loudspeakers, but you won't build much rapport in an urban area that way). Right now the robots are niche players, but as they develop, they may end up doing most of the actual shooting. If Akmed puts 10 of his in harms way, and I risk 0 while still being able to engage him, that's nothing but goodness--warrior ethos or not.