Originally Posted by
UAL T38 Phlyer
Cub:
Apparently, one of the reasons for 25k is the slower onset allows (in theory) one to learn to recognize their own symptoms.
The other reason: as a new USAF student (30 years ago, next month!), we did a rapid-decompression ascent to 35k, if I remember right. But they stopped the 35k profile a few years later. A student either got hurt, or died from some reason....LOC, evolved gas; I never got the full story.
Yeah, DCS and embolism become serious risks with more change in pressure, and a faster rate of change only makes it worse.
To avoid those issues, military jumpers pre-breath O2 well in advance of de-pressurizing...going straight to 35K on air would be a risk I wouldn't care to take just for some training value. Your joints might remind you for the rest of your life...