Having been a comm tech in the Corps, I've been thinking about this one a little bit (strictly out of curiosity). Unmanned aircraft are controlled by radio signals, which can be intercepted or jammed as easily as any radio. FYI, aircraft communications are typically in the UHF band. I guess the question would be how autonomous are they when the remote control is cut off? Do they crash? Do they still fire on targets? Do they just go home?