Mobile Quarantine Facility
![The crew of Apollo 11 in quarantine after returning to Earth, visited by Richard
Nixon.](/Images/godic/202501/27/President_Nixon_welcomes_the_Apollo_11_astronauts_aboard_the_U.S.S._Hornet3601.jpg")
![The MQF, with the Apollo 11 crew on board, is unloaded from a C-141 aircraft.](/Images/godic/202501/27/Apollo_11_Mobile_Quarantine_Facility_unloaded_from_C-1413602.jpg")
The Mobile Quarantine Facility (MQF) is a converted Airstream trailer used by NASA to quarantine astronauts returning from Apollo lunar missions. Its purpose was to prevent the spread of any contagions from the moon, though the existence of such contagions was considered unlikely. It functioned by maintaining a lower pressure inside and filtering any air vented.