Three years gone, thousands of lives lost, tens of billions in debt-funded spending, and we’re right back where we started, with a permanent entanglement in the longest war in U.S. history. President Trump plans to pull about 4,000 U.S. troops from Afghanistan early in 2020, officials in his administration reported in mid-December, a partial withdrawal that would put American force levels in our longest war exactly where they were when Trump entered office. Three years gone, thousands of American and Afghan lives lost, tens of billions in debt-funded spending, and we’re right back where we started, with an apparently permanent...