When one thinks of influential World War II military figures, five-star generals such as Dwight D. Eisenhower and Omar Bradley instantly come to mind. As important as these central figures were to the Second World War, the conflict produced equally effective lower-profile leaders whose influence had an undeniable impact. Among these leaders are William Simpson, commander of the US Ninth Army, and James Moore, his chief of staff. Working in tandem, the pair helmed a unit that gained recognition as "uncommonly normal," an affectionate designation driven by their steadfast professionalism in...