In 1936 in Hamburg, a splendid three-masted sailing ship was christened Horst Wessel in the presence of Adolf Hitler and thousands of cheering Nazis. It became a training vessel for naval officers during World War II. After Germany's defeat, the U.S. Coast Guard found its young crew terrified and half starved. The Coast Guardsmen brought the Germans, so recently their mortal enemies, back to life; the Germans, in return, taught them the ways of the...