FILE – A sign urging safety measures during the coronavirus pandemic is displayed in Teesto, Ariz., on the Navajo Nation on Feb. 11, 2021. The Navajo Nation has rescinded a mask mandate that has been in effect since the early days of the coronavirus …FILE – A sign urging safety measures during the coronavirus pandemic is displayed in Teesto, Ariz., on the Navajo Nation on Feb. 11, 2021. The Navajo Nation has rescinded a mask mandate that has been in effect since the early days of the coronavirus …