A shift in authority has given military officials at the White House a bigger operational role in creating a backup government if the nation's capital were decapitated" by a terrorist attack or other calamity, according to current and former officials involved in the decision. The move ... was made in the closing weeks of the administration of President George W. Bush. Officials said the Obama administration had left the plan essentially intact. Under the revamped structure, the White House Military Office, which reports to the office of the White House chief of staff, has assumed a more central role in setting up a temporary "shadow government" in a crisis. And the office, a 2,300-person outfit best known for flying Air Force One, has taken on added responsibilities as the lead agent in shepherding government leaders to a secure site at Mount Weather in rural Virginia, keeping classified lists of successors and maintaining computer systems, among other operational duties. Many of these types of tasks were previously handled by civilians at other agencies, led by the Federal Emergency Management Agency. Officials at other agencies that have traditionally played critical roles expressed concern that the new structure placed too much power in the hands of too few people inside the White House. They also saw the move as part of the Bush administration's broader efforts to enhance the power of the White House. Though the office reports to the White House, many of its employees are uniformed soldiers, and it has sometimes been led by a military officer. While Obama administration officials would not discuss details of their continuity plan, they said the current policy was "settled," and they drew no distance between their own policies and those left behind by the Bush administration.