Ok, first, I didn´t get it very well. Do you also want to translate Capture the Flag ? (in that case it would be: Atrapar la bandera).
On the other hand, I think you´re talking about Flag football, well, for example here in Venezuela I´ve heard it as Flag football (with no translation), that´s how they called it back in my college years and that´s what I´ve read in the sports section of the newspapers. I guess that if I had to give it a name it would be something like Fútbol de Bandera, but believe me it doesn´t sound very good or common. Maybe you should wait for more opinions.