Over at Aviation Leak, veteran defense analyst and prolific author Bill Sweetman engages in some speculation about the still-grounded F-22 Raptor force, attributing the red stripe to a potentially problematic On-Board Oxygen Generating System, OBOGS.
The system has not been without its difficulties in the the FA-18 Hornet community, apparently:
(Experience) up to 2009 […]
Originally published on July 18, 2011
The Lexicans 
..The more things change… Here I thought all this time pilots just had an oxygen tank of liquid oxygen.