More than any other officer of his generation, Lt. Gen. H.R. McMaster's military career has been defined by a willingness to dissent - often forcefully.
In "Dereliction of Duty," the book he wrote in the 1990s, McMaster blasted the nation's top generals for their unwillingness to tell a domineering president that his war strategy in Vietnam could not work.
More than a decade later as the commander of a 5,000-soldier regiment in Iraq, McMaster essentially ignored the U.S. military's prevailing plan for stabilizing the country, which he concluded was failing badly.
On Monday President Donald Trump chose McMaster as his national security adviser, replacing the...