"In Aztec society, membership in the calpulli established each individual's religious and secular schooling, as well as how they would be trained in warfare. The men of a calpulli served together in battle and on the numerous public works projects. Their soldiers wielded weapons of wood and stone, and they often sought prisoners to be sacrificed in religious ceremonies.
The male children of the upper classes attended a special school called a calmecac. It was there they learned the secrets of the Aztec priesthood and how to perform religious ceremonies and responsibilities - in essence, grooming them for leadership, since in Aztec society government and religion were virtually indistinguishable."