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In page V-2 rocket:

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A submarine-towed launch platform was tested successfully, making it the prototype for submarine-launched ballistic missiles. The project codename was Prüfstand XII ("Test stand XII"), sometimes termed the rocket U-boat. If deployed, it would have allowed a U-boat to launch V-2 missiles against United States cities, though only with considerable effort (and limited effect).[1] Hitler, in July 1944 and Speer, in January 1945, made speeches alluding to the scheme,[2] though Germany did not possess the capability to fulfill these threats. These schemes were met by the Americans with Operation Teardrop.[citation needed]