The Pentagon's transformation czar, Arthur Cebrowski, who has influenced thinking and helped shape policy on how to prepare for future military challenges, will retire at the end of this month on doctor's orders, according to his spokesman. Cebrowski, a retired Navy vice admiral who has been fighting pneumonia for months, informed Defense Secretary Donald Rumsfeld weeks ago of his decision to step down on Jan. 31, said Rob Holzer, spokesman for the Office of Force Transformation. Cebrowski survived a scare...