Essential Tests An Arizona National Guardsman helps collect and prepare COVID-19 test samples at the Arizona Department of Administration in Phoenix before transporting them to a state lab for testing, Aug. 25, 2020. The testing ensures state employees, who work closely with the public, continue to provide essential services. SHARE: Download: Full Size (0.95 MB) Tags: Health, national guard, Coronavirus Credit: Air Force Tech. Sgt. Michael Matkin VIRIN: 200825-Z-CC902-0007.JPG Photo Gallery