Radar picket

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A radar picket is a radar-equipped ship, aircraft, or vehicle used to increase the radar detection range around a force to protect it from surprise attack. Often several detached radar units encircle a force to provide increased cover in all directions.

Formerly, the United States Navy employed radar picket ships such as the USS Hissem (DER-400) to extend the DEW line seaward. The designation DER indicated "Destroyer Escort Radar picket ship."

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