A group of U.S. Army Reserve Soldiers from the 387th Military Police Battalion run past a group of command sergeants major from across the 200th Military Police Command participating in a team-building ruck march during a "CSM Huddle" in Scottsdale, Arizona, Sept. 16, 2017. DOD is evaluating further guidance for the use of fitness trackers used in Soldiers' physical fitness activities after reports of "heat maps" that can track Soldiers' locations using data from the trackers.