The school cannot just come a take the money and buy footballs.
If the booster organization gives (donates) money to the school, asking that the money be used for the band program, the school may use the money as they wish and buy their footballs. (Its a pretty rotten move on the part of admin, but it can and does happen)
The boosters should always buy the actual instruments/supplies that they intend the money be spent on and donate the items. The football team won't have much use for music stands.