WASHINGTON, Nov. 12 - Troubled by news accounts of medical participation in coercive interrogations at Guantánamo Bay and the resulting unease in the professional medical community, the Pentagon led an intense one-day tour of the detention camp last month, several participants said in recent days. The purpose of the trip, some of the participants said, was for the military leadership to convince the ethicists, psychiatrists, psychologists and others who visited the detention camp at the United States Naval Station in Guantánamo Bay, Cuba, that what was occurring there did not violate medical ethics and was necessary to strengthen the nation's...