Readers of the NYT reflect on the Syria-Iraq conflict and the experience in Vietnam. Stuart Gottlieb, who teaches American foreign policy and international security at Columbia University, describes Logevall and Goldstein's Vietnam analogy for Syria as a situation on how one can go wrong by relying on historical reference when new thinking is required based on existing challenges. Others point to the situation in Vietnam as Kennedy's war with 16,000 advisors already on the ground. Kennedy's words "let every country know whether it wishes us well or ill, that we will support any friend, oppose any foe...," were part of the Cold War in the early sixties that Kennedy inherited from Eisenhower and Truman starting with a Communist Iron Curtain falling over Eastern Europe and threatening Western Europe. The situation today is quite different in a Middle East with little to do with Russia and China, at the same time sectarian with Sunni and Shia, and aspirations of Arab people for freedom from dictatorships....