"Orphaned at a young age, Clint Barton became a circus performer specializing in feats of marksmanship. After seeing Iron Man in action, he reinvented himself as a costumed vigilante and became a criminal before approaching Tony Stark, who sponsored him as a member of the Avengers. He possesses near-perfect accuracy with a wide variety of ranged and hand-to-hand weapons, and has designed a number of custom arrows for different battlefield situations."[1]
"Trained to be a master archer by a traveling circus at an early age, Hawkeye joined the Avengers in order to protect the world from evil. While a bit overconfident and rash to act, on the battlefield he is often the catalyst that raises everyone's spirits."[2]