Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: Pentagon Restricts Fitness And GPS Trackers For Deployed Personnel 
  
 Enlarge this image toggle caption Strava Heat Map; Screenshot by NPR Strava Heat Map; Screenshot by NPR 
  
 The Pentagon is banning the use of GPS on mobile devices in war zones and other sensitive locations, saying that fitness trackers and smartphone apps pose a "significant risk" to U.S. military personnel. The move bars deployed service members from using the devices in "operational areas" unless commanders have granted an exception. 
  
 "Effective immediately, DoD personnel are prohibited" from using geolocation apps and features, Deputy Defense Secretary Patrick M. Shanahan wrote in a memo sent Monday to all service leaders. 
  
 The restrictions were issued some six months after the location and movements of U.S. troops were included in a usage map published by the Strava fitness tracking company. The global map reflected more than 1 billion paths that the Strava app tracked — but patterns and locations of U.S. service members could be gleaned from zooming in on sensitive or secured areas. 
  
 Other services have similar usage maps, and the data they collect might be available to other app users or online. 
  
 "These geolocation capabilities can expose personal information, locations, routines, and numbers of DoD personnel," Shanahan wrote, "and potentially create unintended security consequences and increased risk to the joint force and mission." 
  
 The new Pentagon policy allows commanding officers to evaluate whether troops should be allowed to use geolocation technology if they deem it doesn't pose a threat — or if a mission requires the use of GPS apps. It also encouraged commanders of troops not in deployed areas to consider applying the ban. 
  
 The policy calls for training U.S. personnel to use the technology without exposing themselves or fellow service members — training that likely will include advice to turn off data-sharing options in fitness apps. 
  
 By placing a partial ban on the devices, the Pentagon is in a sense warning against overusing its own technology. It was the Department of Defense, after all, that developed and built the web of navigation satellites that became the NAVSTAR GPS system. 
  
 The military has maintained control of the GPS system. But Shanahan acknowledged that as a "rapidly evolving market" of geolocation devices and apps has changed how GPS is used, it has also increased the potential for security vulnerabilities. ||||| Washington (CNN) The Pentagon is banning deployed personnel from using fitness trackers, smartphones and potentially even dating apps that use geolocating features that could reveal the user's location. 
  
 The ban was announced in a Pentagon memorandum issued Friday and signed by Deputy Secretary of Defense Patrick Shanahan. 
  
 "Effective immediately, Defense Department personnel are prohibited from using geolocation features and functionality on government and non-government-issued devices, applications and services while in locations designated as operational areas," the policy memo said. 
  
 The Pentagon said in January it was reviewing policies regarding such devices after it was revealed that Strava, a fitness tracking app that maps people's exercise habits, may have inadvertently revealed the locations of security forces around the world. 
  
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Student:
The Pentagon has restricted the use of fitness trackers by deployed personnel after an app revealed the movement of troops in sensitive areas. Per CNN, Deputy Defense Secretary Patrick Shanahan issued a memo barring use of the technology six months after a fitness tracking company called Strava released a global map of its use that showed the location of troops overseas. Shanahan warned that such data being public can "potentially create unintended security consequences and increased risk" because it exposes personal information, the routines of individuals, and the number of personnel in "operational areas." As NPR notes, the new policy also calls for soldiers to undergo training regarding safety in regard to GPS technology and urges commanders of troops who aren't in deployed areas to consider applying the ban as well.