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一架美国空军 E-3C 预警机任务后降落到北岛海军航空站。（Maintenance Airmen from the 513th Aircraft Maintenance Squadron watch as a Navy MH-60 Seahawk helicopter flies behind an E-3C Sentry on Aug. 24 at Naval Air Station North Island in Coronado, Calif. After each mission, the Airborne Warning and Control System aircraft requires careful inspection and checks to ensure safety of flight.）