The Army Air Forces use the low pressure system (maximum charge 450
pounds per square inch) in preference to the high pressure system (1800
pounds per square inch) for these reasons:
(1) Cylinders do not explode when hit.
(2) Do not "rocket" from moorings when hit.
(3) Less chance for fire or flash burns.
A diagrammatic sketch of the FOUR different oxygen systems is shown
on page 38. EVERY crew member should thoroughly familiarize himself with
the location of each regulator and each portable recharger hose.
The four systems, arranged two on a side, offer great advantages in
combat over a single system. It is possible to redistribute crew members
whose system has been shot out and stay in formation. Everyone must know
these alternate positions. (page 41 for B-17, page 45 for B-24).