Stock Photo - Jun. 06, 1971 - U.S. Submarine Tracer 'Plane For U.S.-Japan Naval Exercises: This unusual U.S. Navy 'plane called the 'E1 Tracer' will feature in the coordinated naval exercises of the U.S. Seventh Fleet, and the Japanese Maritime Self Defense Force in the Sea of Japan from May 28 to June 5, 1971. The 'E1 Tracer' is equipped with the latest electronic sub-marine detecting apparatus. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

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