sentences:  More than 160,000 youth and adults are members of the Order of the Arrow.Unit elections of the OA are allowed in Scouts BSA, Venturing, and Sea Scout units.To be eligible for induction, a youth must have spent at least 15 days and nights camping within the last two years including one long-term camp consisting of at least five consecutive nights, be under the age of 21, hold the Scouts BSA First Class rank, the Venturing Discovery Award, or the Sea Scout Ordinary rank or higher, be approved by their unit leader and be elected by the youth members of their unit.