Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
Mobile Quarantine Facility personally welcomed them back to Earth aboard the recovery ship USS "Hornet" after splashdown. The trailers housed the three crew as well as a doctor and an assistant for cleaning and cooking. Four MQFs were built for NASA: The quarantine requirement was eliminated following Apollo 14 once it was proven the moon was sterile and that the facilities were therefore unnecessary. Mobile Quarantine Facility The Mobile Quarantine Facility (MQF) is a converted Airstream trailer used by NASA to quarantine astronauts returning from Apollo lunar missions for a duration of 21 days. Its purpose was to prevent the spread of any