I photographed this NASA Mobile Quarantine Facility at the NASM Udvar-Hazy
This is one of four Airstream trailers converted by NASA for astronauts returning from the Moon, including Apollo 11 astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins immediately after their return to Earth.
MQF contained living and sleeping quarters, a kitchen, and a bathroom. Quarantine was assured by keeping the air pressure inside lower than the pressure outside and by filtering the air vented from the facility.