A word of caution: Scouts should not be in uniform when ringing the bell for Salvation Army, or otherwise collecting money for another organization.  

From  the Guide to Unit Money Earning Projects:
The BSA Rules and Regulations state, “Youth members shall not be permitted to serve as solicitors of money for their chartered organizations, for the local council, or in support of other organizations. Adult and youth members shall not be permitted to serve as solicitors of money in support of personal or unit participation in local, national, or international events.”

For example: Boy Scouts/Cub Scouts and leaders should not identify themselves as Boy Scouts/Cub Scouts or as a troop/pack participate in The Salvation Army’s Christmas Bell Ringing program. This would be raising money for another organization. At no time are units permitted to solicit contributions for unit programs.

scouting.org/filestore/pdf/510-274.pdf

---