In the rugged mountainous region along the border of Afghanistan and Pakistan, in an area often referred to as a “lawless frontier,” a U.S. military special forces unit is on a mission to help locate and track Al Qaeda operatives. It’s risky business. The soldiers must travel dangerous and inhospitable roads and camp out far from central-command support. These “dismounted” soldiers will be on their mission for days on end. Their backpacks, which carry all the food, tents, and artillery they need for the mission, weigh an average of 120 pounds. As part of the load, each soldier also carries a collection of mission-critical electronic devices, including radio communication units, GPSs, and infrared ...

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