Cyclists say Armstrong's confession and calls to clean up the sport may lead to a new era.
"From day one, we always hoped this investigation would bring to a close this troubling chapter in cycling's history and we hope the sport will use this tragedy to prevent it from ever happening again," USADA CEO Travis Tygart said in a statement in October.
"Our mission is to protect clean athletes by preserving the integrity of competition not only for today's athletes but also the athletes of tomorrow. We have heard from many athletes who have faced an unfair dilemma -- dope, or don't compete at the highest levels of the sport. Many of them abandoned their dreams and left sport because they refused to endanger their health and participate in doping. That is a tragic choice no athlete should have to make."