These smartphones on soldiers' chests are becoming an important tool in the US Army's plans for a high-tech fight

The End User Devices are attached to soldiers' chests and run on batteries carried on their backs. US Army photo by Sgt. Nathan Arellano Tlaczani US Army soldiers are using smartphones mounted on their chests for mapping and communicating. Soldiers found the End User Devices useful but ran into connection issues and said they still need physical backups. Army leaders used a recent exercise to assess how many soldiers should have the devices. The soldiers stood at the edge of a building,…