ON THE COVER: Although Canada did not participate militarily in Vietnam, that nation played a multifaceted role during the war. As Bill Triplett writes, many of its citizens crossed the border and joined the U.S. armed forces. Official Canadian involvement also included work with the International Commission for Supervision and Control and Canadian-run in-country hospitals. See Marc Leepson’s review of John Boyko’s book, The Devil’s Trick: How Canada Fought the Vietnam War. On the cover, Canadian ICSC military observers check maps in Vietnam in January 1973. Photo by Boris Spremo/Toronto Star via Getty Images.