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The German Sachsen-class frigate Hessen (F 221) and USS Normandy (CG 60) participate in Exercise Neptune Warrior off the coast of Scotland on May 1, 2007. Hessen uses a high-frequency active phased array radar (APAR) forward, and long-range target detection radar aft, while the Aegis cruiser employs the SPY-1 passive phased array. ................
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