I was looking into buying a USA jersey, especially now that they're on sale at ussoccer.com and worldsoccershop, presumably because the new jerseys will be unveiled soon. My question is related to players changing their jersey number. I know Landon Donovan used to wear 21 and now wears 10. I want to get an Altidore jersey and Wikipedia says he's worn #14 for his two senior team call ups. What are the chances of him changing his number? It wouldn't be that big of a deal to have a kit with his old number, but it got me thinking and I was wondering how often it happens.