What an interesting subject! The deployment of UxV's (Unmanned "x" Vehicles, "x" being surface, aerial or subsurface) is indeed changing the landscape. Most are still still not "autonomous" but remained tethered to a ground operator. ASince Iran compromised the ground/air link of a Predator and landed it within Iraq, however, the trend is towards "autonomy" so that a UxV can make its own decisions about modifying routes, mission and even when to fire if it is armed. These are complex issues. The recent Army/Marine Corps decisions to terminate armor forces and replace them with lighter, faster vehicles which control large numbers of UxV's and which may be, themselves, unmanned shows how revolutionary and significant these changes really are. The effect of offensive UxV forces is only limited by the "mission package" a UxV can carry. Guns? Bombs? Laser designators? Jammers? CHAMP?
Which brings us to defense. CHAMP (the portable EMP generator built by Boeing) may be the best defens e against enemy UxV's. It may ground them altogether, along with aircraft and missiles.
Wow... I'm looking for this thread to go wild!
Thanks for the post!