I think all the 10th Mountain veterans I've talked to are gone now. Things would be very different today without them.
A glimpse of one can be found in this NWMJ story:
Duke Watson: A Mountaineer For All Seasons
FA of Goldenhorn, Mox, Fury, Black Peak etc. And first ski descents of Snowgrass, Ruby, and big Chiwakum. Who Knew?