Tranquillitas Ordinis: The Present Failure and Future Promise of American Catholic Thought on War and Peace. By George Weigel. (New York: Oxford University Press, 1987. x, 489p. $27.50). - The Nuclear Dilemma and the Just War Tradition. Edited by William V. O'Brien and John Langan (Lexington, MA: D. C. Heath, 1986. viii, 257p. $25.00).