Rank advancement in Cub Scouts is not like rank advancement in Scouts BSA. In Cub Scouts, it's grade- or age-based. In Scouts BSA, the youth hold the reins.
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Cub Scout Advancement, Atlanta Area Council
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Cub Scouting (Boy Scouts of America) - Wikipedia
Difference between Cub Scout and Scouts BSA advancement
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Difference between Cub Scout and Scouts BSA advancement