A set of newly established overland supply routes to landlocked Afghanistan is expected to play an increasing role in orchestrating and sustaining the surge of 30,000 additional U.S. troops to that country, announced by President Obama earlier this month, according to officials and documents. Military logistics planners spent the past year designing what is known in Pentagon jargon as the "Northern Distribution Network," or NDN. The network consists of four routes on which commercial freight companies transport troop supplies in...