The U.S. military command covering South America intercepts only about a third of the drug shipments and other illegal traffic that it knows about, because it and allied nations simply lack the assets to intercept most of the suspect boats and aircraft that their intelligence identifies, locates, and tracks. That shortfall in interception results in part from a shrinking U.S. Navy and the diversion of Air Force reconnaissance assets to the war zone in Afghanistan. "We intercept about 33 percent of what we know is out there, and that's just a limitation on the number of assets," said Air Force Gen. Douglas Fraser, chief of the U.S. Southern Command, at a breakfast with reporters this morning. And, Fraser admitted, that percentage is "going down... More is getting through."