Aircraft Guidance An airman, assigned to the 721st Aerial Port Squadron at Ramstein Air Base, Germany, marshals a C-17 Globemaster III transporting three COVID-19 patients from Afghanistan during the first operational use of the Transport Isolation System, April 10, 2020. The TIS is an infectious disease containment unit designed to minimize contamination risk to aircrew and medical attendants, while allowing in-flight medical care for patients afflicted by a disease — in this case, COVID-19. SHARE: Download: Full Size (2.17 MB) Credit: Air Force Staff Sgt. Devin Nothstine VIRIN: 200410-F-BT441-1165A.JPG Photo Gallery