The idea is as old as human conflict. Even the best plans collapse on contact with the enemy. So how should U.S. military forces plan for a future that's nothing but variables? Two long-term military scholars ponder this idea in a new book. With highlights, authors and visiting professors at Johns Hopkins University, Dr. Nora Bensahel and Ret. Army Lt. Gen. Dave Barno.\nLearn more about your ad choices. Visit podcastchoices.com/adchoices