This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
GK Navy Flight Training Oxygen tank operators stand by controls as the Watch Cadet Pilots qualify for high altitude flying during World War II. The Chief Petty Officer is in charge of the crew. Man in the foreground controls pressure while the man at the microphone gives directions to the cadets inside the tank. Photographed prior