Dec. 4, 1989 file photo shows the launch of a Trident II, D-5 missile from the submerged USS Tennessee submarine in the Atlantic Ocean off the coast of Florida. As of mid-2010, 12 operational U.S. nuclear-missile submarines carry a total of 288 Trident missiles. A movement is growing worldwide to abolish nuclear weapons, encouraged by President Barack Obama's endorsement of that goal. But realists argue that more stability and peace must first be achieved in the world.
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