Final answer:
The Bureau of Indian Affairs sanctioned two primary requirements for Navajo enlistment in the Marines during WWII: rigorous training and memorization of code pages. Navajo code talkers used their complex language to communicate securely in battle, contributing significantly to Allied successes.
Step-by-step explanation:
The two requirements that the federal Bureau of Indian Affairs had sanctioned for Navajos to join the Marine forces during World War II encompassed intense training under physically harsh conditions and the memorization of numerous pages of codes.
Young Navajo men, some as young as 15, were often inclined to lie about their age to enlist and became part of a specialized group known for their unique contributions to the war effort. Their complex native language was utilized to develop an unbreakable code that was used to transmit vital communications during key battles in the Pacific theater.
These Navajo code talkers, as they were called, memorized up to 17 pages of codes and transmitted messages without writing anything down, relying on the oral traditions of their culture. Their intelligence, dedication, and bravery were crucial to the Allied victories in battles such as Guadalcanal, Iwo Jima, Peleliu, and Tarawa.