I must be bored!
C17 CBRs freely available
here on page 33 for an unsurfaced strip.
At max strip landing weight of 447klbs, you get a CBR of 8 (10 passes)and 12 (100 passes).
It's a bit outside my experience but does anyone know the typical CBR of some example airfields - Pendine Sands or something - to calibrate a simple brain?
The bigger picture, i fear, is that strip performance isn't really a factor given that we'll always have the J-model and live in a predominantly Strat era (for now, at least). I'll stand by for a slating from the Tac-wallers out there but it strikes me that what really counts is the ability to move sheer bulk to support Ops in a far away place for the foreseeable...more C-17s please.
Uncle G