WINDOW ROCK, Ariz. (AP) — The Navajo Nation says it will maintain a mask mandate even as the last of the states around it dropped the requirement. The tribe implemented a mask mandate early on in the pandemic to prevent the spread of COVID-19. Residents …WINDOW ROCK, Ariz. (AP) — The Navajo Nation says it will maintain a mask mandate even as the last of the states around it dropped the requirement. The tribe implemented a mask mandate early on in the pandemic to prevent the spread of COVID-19. Residents …