The Mobile Quarantine Facility (MQF) is a converted Airstream

Airstream

Airstream is a brand of luxury recreational vehicle manufactured in Jackson Center, Ohio, USA. It is currently a division of Thor Industries. The company, which now employs fewer than 400, is the oldest in the industry. Airstream trailers are easily recognized for their distinctive rounded...

 trailer used by NASA

NASA

The National Aeronautics and Space Administration is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research...

 to quarantine

Quarantine

Quarantine is compulsory isolation, typically to contain the spread of something considered dangerous, often but not always disease. The word comes from the Italian quarantena, meaning forty-day period....

  astronauts returning from Apollo lunar missions. Its purpose was to prevent the spread of any contagion

Infectious disease

Infectious diseases, also known as communicable diseases, contagious diseases or transmissible diseases comprise clinically evident illness resulting from the infection, presence and growth of pathogenic biological agents in an individual host organism...

s 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.

The MQF contained living and sleeping facilities as well as communications which the astronauts used to converse with their families. The Apollo 11

Apollo 11

In early 1969, Bill Anders accepted a job with the National Space Council effective in August 1969 and announced his retirement as an astronaut. At that point Ken Mattingly was moved from the support crew into parallel training with Anders as backup Command Module Pilot in case Apollo 11 was...

 crew also used this to speak with President Nixon

Richard Nixon

Richard Milhous Nixon was the 37th President of the United States, serving from 1969 to 1974. The only president to resign the office, Nixon had previously served as a US representative and senator from California and as the 36th Vice President of the United States from 1953 to 1961 under...

 who personally welcomed them back to Earth aboard the recovery ship after splashdown.

Four MQFs were built for NASA:

Mission	Designation	Disposition
Apollo 11 Apollo 11 In early 1969, Bill Anders accepted a job with the National Space Council effective in August 1969 and announced his retirement as an astronaut. At that point Ken Mattingly was moved from the support crew into parallel training with Anders as backup Command Module Pilot in case Apollo 11 was...	MQF003	For years on display at the U.S. Space & Rocket Center, now on display at the National Air and Space Museum National Air and Space Museum The National Air and Space Museum of the Smithsonian Institution holds the largest collection of historic aircraft and spacecraft in the world. It was established in 1976. Located in Washington, D.C., United States, it is a center for research into the history and science of aviation and... 's Steven F. Udvar-Hazy Center Steven F. Udvar-Hazy Center The Steven F. Udvar-Hazy Center is the Smithsonian National Air and Space Museum 's annex at Washington Dulles International Airport in the Chantilly area of Fairfax County, Virginia, United States.... .
Apollo 12 Apollo 12 Apollo 12 was the sixth manned flight in the American Apollo program and the second to land on the Moon . It was launched on November 14, 1969 from the Kennedy Space Center, Florida, four months after Apollo 11. Mission commander Charles "Pete" Conrad and Lunar Module Pilot Alan L...	MQF002	Converted for various purposes and found near Marion, Alabama Marion, Alabama Marion is the county seat of Perry County, Alabama. As of the 2000 census, the population of the city is 3,511. First called Muckle Ridge, the city was renamed after a hero of the American Revolution, Francis Marion.-Geography:... , now on display at the U.S. Space & Rocket Center.
Apollo 13 Apollo 13 Apollo 13 was the seventh manned mission in the American Apollo space program and the third intended to land on the Moon. The craft was launched on April 11, 1970, at 13:13 CST. The landing was aborted after an oxygen tank exploded two days later, crippling the service module upon which the Command...	MQF001	Not used for the crew because they never set out on the moon. For some time the USDA used it. Its present disposition is unknown.
Apollo 14 Apollo 14 Apollo 14 was the eighth manned mission in the American Apollo program, and the third to land on the Moon. It was the last of the "H missions", targeted landings with two-day stays on the Moon with two lunar EVAs, or moonwalks....	MQF004	At the USS Hornet Museum USS Hornet Museum The USS Hornet Museum is a museum ship in Alameda, California, USA.It is composed of the aircraft carrier, exhibits from the NASA Apollo moon exploration missions, and several retired aircraft from the Second World War and the transonic and early supersonic jet propulsion period...  in Alameda, California Alameda, California Alameda is a city in Alameda County, California, United States. It is located on Alameda Island and Bay Farm Island, and is adjacent to Oakland in the San Francisco Bay. The Bay Farm Island portion of the city is adjacent to the Oakland International Airport. At the 2010 census, the city had a... .

The quarantine requirement was eliminated following Apollo 14 once it was proven that the moon was void of life and the facilities were no longer used.