Fitness trackers The Defense Department urges service members and DoD civilians with wearable electronic devices to use the strictest privacy setting. Officials made the suggestion after publication of a “heat map” showing concentration of U.S military personnel overseas. DoD photo by Jim Garamone SHARE: Download: Full Size (0.45 MB) Credit: Jim Garamone VIRIN: 180129-D-FN314-001A.JPG Photo Gallery