DEFENDING AMERICA David H. Hackworth 17 March 98 LOOSE LIPS, SINK SHIPS.. While at the Pentagon, Monica Lewinsky traveled with Defense Secretary William Cohen, sat in on briefings where the highest secrets were discussed and routinely handled highly classified documents top-secret documents, which, if they fell in the wrong hands, could put America at high risk and cost the lives of our warriors. But no sweat. Lewinsky had all the appropriate clearances, right? No doubt her background had been thoroughly checked out by investigators. Or perhaps she'd been given a top-secret clearance in a hurry on order of a...