Ground Zero?

Just about every member of the Republican party in the US Senate seeks to find one reason or another to oppose the nomination of Chuck Hagel as Secretary of State. He dared to employ the expression, “Jewish Lobby” instead of “Israel Lobby” although many in Congress fear the “Armenian Lobby” and for  years there was an “Irish Lobby. Well, Chuck again used the wrong words. He indicated his support for an international movement known as “Ground Zero” which seeks the end of atomic weapons on this planet. Hagel argues for the end of nuclear weapons, not entirely in the short run, but eventually. Wow, how can US forces in Afghanistan fight without their atomic bombs?

Many in the international defense community believe, whatever benefits of nuclear weapons during the Cold War, there is no longer need for them. My question: against whom would nuclear weapons be employed in 2013?