"Do you know what a 'loitering missile' is?" Chase asked. Lanier nodded, but Villiers' expression was blank. "It's a special kind of homing missile. Very expensive and requiring very special programming. Basically, it hangs around waiting for its target in the area where there's going to be a fight. Once it spots the target—usually by the fact that the target is using its radar—it homes in and hits."