 The Green Bay Packers became the first team to officially unveil a third uniform for 2010, a throwback uniform based on their 1929 uniforms when they won their first NFL championship.The throwbacks are as accurate as possible while complying with current NFL guidelines, with a brown modern-shell helmet in place of the leather helmets of 1929, along with blue jerseys and gold circles with the jersey numbers nested within the circles, and brown pants.Like throwbacks worn in recent seasons by the San Diego Chargers, Dallas Cowboys, Buffalo Bills, New York Jets, and the archrival Minnesota Vikings, these throwbacks will be a permanent addition to the Packers uniforms, unlike throwbacks worn by the Detroit Lions and Pittsburgh Steelers that were intended as one-time deals but made permanent, as well as several one-shot throwbacks in recent years.