The 2009 Abilene High School Eagles hold their championship trophy and celebrate in the aftermath of their 28-17 victory over the Katy High School Tigers. Tom Goldman/NPR hide caption

itoggle caption Tom Goldman/NPR

George Visger, 51, has severe short-term-memory loss due to multiple head injuries experienced while playing football. Lianne Milton for NPR hide caption

itoggle caption Lianne Milton for NPR

Umpire Gilbert signals a score. He has been a high school football official for the past 20 years. Tom Goldman/NPR hide caption

itoggle caption Tom Goldman/NPR