The Defense Department plans to retire about 2,000 nuclear warheads between fiscal years 2007 and 2012 without making major force structure changes like those coming in the next five years, according to DOD officials and documents. By FY-07, major segments of the ICBM, submarine, and bomber fleets will be retired from nuclear service, but no further delivery system cuts are planned. The most dramatic changes to the U.S. nuclear inventory are slated to occur over the next five years through...