2017 at Wright Pat. The chamber was part of a 3 day physiology class. Lots of great info in that class that I would have liked to have known at the beginning of my career. Ear protection was interesting and was a big take-away for me. The anxiety leading up to the decompression experience was worse than the chamber itself. The part about expelling chunky (or soupy) gas at the moment of explosive decompression the most concerning. Never happened tho. Survived with dry pants thankfully. As I recall our decompression occurred at Between FL250 and FL300. The USAF was no longer doing decompressions at extreme altitudes.
The chamber looked like something out of a Jules Verne movie or perhaps 20,000 Leagues Under The Sea. Big rivets.
The 3 day class was great. Thanks to the many great folks at WPAFB. Strongly recommend for all.