The vast American landscape breeds badasses of every stripe, like Elvis Presley, Ulysses S. Grant, Ted Williams and John F. Kennedy. From military mavericks to pop-culture royalty, these four iconic figures carved their own paths, pushed their bodies to the limit and stared down fear in true tough-guy fashion. Will the "King of Rock and Roll" reign supreme over the "King of Camelot"? Will the "Butcher of the Civil War" battlefield slay the "Splendid Splitter"?