New Jersey National Guard officials say they are prepared to send as many as 650 troops to back up border patrols along the US-Mexico border.....because the Pentagon has guaranteed to cover the cost of the deployment..........The troops will be volunteers, going on the mission in lieu of annual training. Gov Corzine must sign a formal agreement before any troops deploy. Despite an end-of-the-month deadline to have 2,500 troops along the Mexican border, only 483 were in position Friday working with the U.S. Border Patrol.....according to the National Guard Bureau, an arm of the Pentagon. ......more than 2,000 others were somewhere...