The United States is quietly preparing for the use of tatical nuclear weapons in a war against Iraq and military planners have been actively studying lists of potential targets, the media reported Saturday.The preparations include possible use of so called 'bunker buster' nuclear weapons against deeply buried military targets the Los Angeles Times reported on Saturday morning quoting William M. Arkin.Defence officials have been focusing their plans on the use of tatical nuclear arms in retaliation for a strike by the Iraqis with chemical or biological weapons, or to preempt one, the daily said.US Administration officials believe that in some...