All Navajo Nation executive branch employees will need to be fully vaccinated against the virus that causes COVID-19 by the end of September or be required to submit to regular testing, according to an executive order announced by President Jonathan Nez Aug. 22.All Navajo Nation executive branch employees will need to be fully vaccinated against the virus that causes COVID-19 by the end of September or be required to submit to regular testing, according to an executive order announced by President Jonathan Nez Aug. 22.