"DEW craft," he said, "defensive early warning. Basically a plane with air and ground-search radar. Not as sophisticated as the regular EW craft, but dangerous enough. If it spots us, it can direct other units to our general area. A regular EW craft could pass on telemetry information that units with that capability could use to attack us from a long distance. Even kilometers away. They wouldn't have to see us as long as the EW craft could."