Nuclear Security

The world's nuclear arsenal is shrinking – but it's becoming more advanced

The Ohio-class ballistic missile submarine USS Tennessee returns to Naval Submarine Base Kings Bay, Georgia in this February 6, 2013 handout photo. The Tennessee and 13 other Ohio-class submarines are critical elements of the U.S. nuclear deterrent but the oldest has been in service for 33 years and the end of the fleet's useful life of 42 years is in sight. Every nuclear weapons delivery system in the U.S. arsenal ? the so-called triad of bombers, ballistic missiles and submarines ? will have to be replaced in the coming 30 years. REUTERS/Mass Communication Specialist 1st Class James Kimber/U.S. Navy/Handout via Reuters (UNITED STATES) - Tags: MILITARY POLITICS) THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS - TM3EAAK0WCJ01

Modernization of nuclear forces continues Image: REUTERS

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