Last week Defense Secretary Ashton Carter laid a wreath at the Vietnam Veterans Memorial in Washington in commemoration of the "50th anniversary" of that war. The date is confusing, as the war started earlier and ended far later than 1966. But the Vietnam War at 50 commemoration presents a good opportunity to reflect on the war and whether we have learned anything from it. Some 60,000 Americans were killed fighting in that war more than 8,000 miles away. More than a million Vietnamese military...
