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A Helicopter Anti-submarine Squadron 9 (HS-9) SH-3 Sea King helicopter from the U.S. Navy and a Helicopter Anti-submarine Squadron 1 (HS-1) SH-3 Sea King helicopter from the Brazilian navy lower AQS-13 dipping sonar during Exercise Topex 1-87, an anti-submarine warfare exercise in which four inter-mixed U.S. and Brazilian helicopter flight crews participated

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