COVID-19 Test Marines undergo a COVID-19 swab test at the Royal Australian Air Force Base Darwin in Australia, July 19, 2020. Marines at the base received at least two negative COVID-19 tests before completing their 14-day quarantine. SHARE: Download: Full Size (1.66 MB) Tags: Marine Corps, Coronavirus Credit: Marine Corps Cpl. Sarah Marshall VIRIN: 200719-M-MP127-1002T.JPG Photo Gallery