Quote Originally Posted by Snowman78 View Post
Well, I hike 14er's with out oxygen so I think its okay. Unless you mean 12,500 AGL
You can walk as high as you want, but there are lots of regs for flying and jumping.

Quote Originally Posted by Hoser View Post
It has been 13+ years since I did any HALO, but...

Depends on the Military or civilian side of the house and how long you are above 12,500 ect.

In a nutshell (civilian) above 15K everyone must be on the hose. Military, crew must be on O2 above 10K and jumpers above 13K.

Above 18K you must prebreathe O2 for 30 minues before depressurizing.

And tons more rules like it.
Sooooo when I said you needed O2 above 12,500.... I was pretty far off. Thanks for the correction and added info.