Testing First Marines assigned to Marine Rotational Force - Darwin undergo biosecurity and COVID-19 testing as they arrive at Royal Australian Air Force Base Darwin in Darwin, Australia, July 24, 2020. They will reside in quarantine accommodations until they receive a second negative COVID-19 test and complete their 14-day stay. SHARE: Download: Full Size (0.12 MB) Tags: Coronavirus Credit: Marine Corps Cpl. Sarah Marshall VIRIN: 200724-M-MP127-1262.JPG Photo Gallery