Final answer:
The author does not mention the idea that Navajo men who volunteered for WWII were living isolated lives; instead, it focuses on their enlistment and contributions such as the Navajo Code Talkers.
Step-by-step explanation:
The idea that Navajo men who volunteered to fight in World War II had been living isolated lives is not mentioned by the author in the provided reference material. The material does highlight the significant contribution of Native Americans to the war effort, noting the enlistment of large numbers of Native men eligible for service and the unique role played by the Navajo Code Talkers. It also mentions the patriotism and desire for acceptance that motivated many to enlist. However, it does not specifically support, oppose, or comment on the level of isolation in the pre-war lives of these servicemen.