Mobile submarine simulator
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The mobile submarine simulator (MOSS) MK70 is a sonar decoy used by submarines of the United States Navy. It was a 10-inch vehicle, without an explosive warhead, but able to generate both an active sonar echo and a passive sound signature recorded to be extremely similar to that of the launching submarine.
The MOSS first entered service in 1976 and was deployed on all American ballistic missile submarines from the 1980s until it was withdrawn in the mid 1990's.