The caller told the operator, "we're trying to remain a little subtle." ABC News has obtained a copy of the 911 call requesting an ambulance for Defense Secretary Lloyd Austin, who was transported from his Virginia home to Walter Reed Hospital after suffering complications from a surgery to treat prostate cancer. In the call, placed on Jan. 1 and obtained through a Freedom of Information Act request, a federal employee working for Austin asks the operator for the ambulance to be discreet. "Can I ask -- that the ambulance not show up with lights and sirens? We're trying to remain...