RabidGibbon you were a bit misleading, the SAS had excellent survival skills and often had to walk many miles (can remember a desert treck of 70 iirc specifically, it was the norm not the exception) and were famed for their harsh training and unbelievable endurance. I use the past tense as I do not know if all of that is still true, though I know their training is still famous for its harshness.