They've put in innumerable hours of sweat, blood and tears to get where they are today. They are among the best of the best and are ready to prove their mettle. 529 athletes from 45 states will represent the United States at the 2012 Olympic Games in London. They are competing in events as diverse as athletics, fencing, rowing, soccer and basketball. For everyone, from swimmer Katie Ledecky, 15, to 54-year-old equestrian jumper Karen O’Connor, these Games represent the culmination of all the hard work and dedication they've put in to win the coveted medal. It's time to meet the Olympians from…