Check out this invention which is replacing the Altitude Chamber in USN/USMC Aviation Physiology Training - it called the Reduced Oxgyen Breathing Device (ROBD)
Environics - Reduced Oxygen Breathing Device 2 (ROBD 2) - Product Data
This should give you some material for your project regarding training and uses and I can tell you from experience that the ROBD is better training and that aircrew are recognizing hypoxia related events more accurately than before this training was available.
USMCFLYR