amabutho
Amabutho refers to military regiments or age-grade groups within Zulu society. Historically, the amabutho system was a crucial aspect of Zulu social and political organization, particularly under King Shaka. Young men were conscripted into these regiments, forming a standing army that was instrumental in the Zulu kingdom's expansion and defense. The system was not solely military; it also served as a mechanism for social integration, discipline, and the instillation of loyalty to the king and the nation.
Membership in an ibutho was based on age, and individuals progressed through different regiments as they aged.