Combine participant, 16 year old, Darius Alexander of American High School in Miami, Fla., listens as four-time Super Bowl Champion and NFL Hall of Famer, Lynn Swann, speaks at the 2015 Army All-American Bowl Combine Welcome Ceremony. The National Combine provides 500 of the nation's top underclassmen an opportunity to showcase their football abilities and talents and participate in educational and leadership seminars.