A steady flow of policy documents details how the branches of the military — and the Defense Department as a whole — will prepare for the wars of the future. But the changing nature of warfare may have the United States preparing for the wrong war. Retired Army Lt. Gen. David Barno is senior fellow and co-director of the Responsible Defense Program at the Center for a New American Security. He was the first Commander of Military Operations-Afghanistan. He writes on War On The Rocks, under the title “The Shadow Wars of the 21st Century,” that war is morphing. He explained how on In Depth with Francis Rose.