WRIGHT-PATTERSON AFB, Ohio, Aug. 19 -- The U.S. Air Force Wright-Patterson Air Force Base issued the following news: By Kimberly Gaither 88th Air Base Wing Wright-Patterson AFB will conduct an active-shooter exercise Aug. 18 from 9 to 10:30 a.m. Communities surrounding the installation may hear emergency sirens and announcements over the "Giant Voice" public address system. During the exercise, communities are advised not to call 911. Emergency response agencies and dispatch centers from ne  more