The Environics® Series 6202 Reduced Oxygen Breathing Device 2 is the next generation system that simulates altitude exposure and can be utilized for both research and hypoxia training.
The U. S. Military currently uses the ROBD 2 to train aircrew to recognize the signs and symptoms of hypoxia and to perform the appropriate emergency procedures and additionally, conducts hypoxia research.
Documentation
ROBD2 Data Sheet