Personnel from the British Army's Yorkshire Regiment carry out extreme winter training in snowy Estonia!
1960's Vibration Tests On Pilots
In order to determine the effects of vibrations on the human body the United States Air Force performed a number of "vibration platform" tests. These tests could change the frequency and intensity of the vibrations. In this short film we see the results of a low frequency (4hz) vibration - clearly it would be very difficult for a pilot or astronaut to perform any useful functions when such vibrations occurred.