WASHINGTON - Everyone is saying that Secretary of Defense Donald Rumsfeld’s days are numbered, thanks in part to increasing calls by some former generals for Rumsfeld’s resignation. But Rumsfeld was hired by George W. Bush to do precisely what he has done to the consternation of the generals who are now coming out to complain about him. When President Bush brought Rumsfeld back to the Pentagon, the president told him to shake up the Pentagon, to transform it from the Cold War structure and culture that it was stuck in to a new force with strategies that could respond to...