DETROIT - An FBI agent who led the investigation of nine Michigan militia members charged with trying to launch war against the federal government couldn't recall many details of the two-year probe yesterday during questioning by defense lawyers. Even the judge who must decide whether to release the nine until trial was puzzled. "I share the frustrations of the defense team … that she doesn't know anything," U.S. District Judge Victoria Roberts said after agent Leslie Larsen confessed she hadn't reviewed her notes recently and couldn't remember specific details of the case.