WASHINGTON—U.S. Defense Secretary Jim Mattis has ordered a review of security protocols, officials say, after fitness tracking devices broadcast patterns of movement at military facilities around the world, including in war zones.
Nathan Russer, a student at the Australian National University in Canberra, drew attention to data when he wrote on Twitter about the images after stumbling upon GPS tracking company Strava’s Global Heatmap. It can be viewed here.
