WASHINGTON US troops facing extended deployments amid the danger, heat, and uncertainty of an Iraq occupation are suffering from low morale that has in some cases hit "rock bottom." Even as President Bush speaks of a "massive and long-term" undertaking in rebuilding Iraq, that effort, as well as the high tempo of US military operations around the globe, is taking its toll on individual troops.Some frustrated troops stationed in Iraq are writing letters to representatives in Congress to request their units be repatriated. "Most soldiers would empty their bank accounts just for a plane ticket home," said one recent Congressional...