Venezuelan Narco-Terrorism, Encroaching Arctic Among Top U.S. Threats

Arctic encroachment, Venezuelan narcoterrorism among top threats, officials say.

In this Monday, March 12, 2012 photo, Sonar Technician James Corriveau, of Boston, Mass., cleans the weapons shipping hatch on the USS Connecticut, a Sea Wolf-class nuclear attack submarine, during a port call at a U.S. naval base at Yokosuka, south of Tokyo, Japan. The submarine took part in exercises at the North Pole in 2011 to improve the U.S. Navy's operations in the Arctic.

Sonar Technician James Corriveau cleans the weapons shipping hatch on the USS Connecticut, a Sea Wolf-class nuclear attack submarine, which took part in exercises at the North Pole in 2011 to improve the U.S. Navy's operations in the Arctic.

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