What is the setting of Code Talker: A Novel About the Navajo Marines of World War Two by Joseph Bruchac?

The novel is set in the 1930s and 1940s. The novel begins with the main character going to boarding school in Gallup, New Mexico. The novel continues, taking the main character back to the Indian Reservation, to military camps, and finally to war in the Pacific. The latter half of the novel takes place during battles that are true to the history of World War II, giving the reader some true information about that time in history.