U.S. military forces running drug interdiction missions in Central and South America are gradually losing their ability to disrupt illicit trafficking, with sequestration, shifting priorities and other budgetary constraints taking aim at the resources needed for the mission, according to a senior military official. Due to a lack of surface vessels and other assets, Joint Interagency Task Force-South doesn't have the ability to target three-quarters of the cases identified by its intelligence arm, Rear Adm. Charles Michel, the task force's...