President Bush has codified a number of changes to the U.S. military's command structure in an update of the Pentagon's Unified Command Plan, realigning territorial responsibilities and assigning new missions to the top brass who oversee American forces around the world. Details of the Unified Command Plan 2006 -- spelled out in a classified document approved by Bush on May 5 -- deal with a wide range of issues, including conducting computer-network attacks, defending domestic air space and reassigning geographic...