On March 28, 2020, the DHS Cybersecurity and Infrastructure Security Agency (CISA) issued an updated memo identifying Essential Critical Infrastructure Workers During Covid-19 Response. The updated list provides a greater level of clarity on entities within industries, such as transportation and logistics, that are essential to the viability of critical infrastructure. The list is intended to guide jurisdictions considering COVID-19-related restrictions. The list is advisory, not a federal directive or standard.