Which military branch primarily used the Navajo Code Talkers?

The primary military branch that utilized the Navajo Code Talkers was the Marines. During World War II, the Marines sought a secure communication method that could be quickly conveyed and hard for the enemy to decipher. The unique Navajo language was chosen because it was complex and had no written form at the time, making it an ideal choice for creating a code. The drafted Navajo men developed a coding system based on their language, which proved essential in numerous battles in the Pacific Theater, allowing for effective and rapid communication of military strategies.

This choice stands out as the Navajo Code Talkers were specifically recruited and trained to support the Marine Corps, firmly establishing their crucial role in Marine operations during the war. Other branches, such as the Army and Navy, did not employ Navajo Code Talkers to the same extent as the Marines did; therefore, those options do not reflect the primary utilization of the code.