Bingo, the Buck 119 it is... I first thought it was it's bigger brother the 120 "general purpose" knife, but nope, since the 120 has been discontinued for a while now. It's the 119 he's using while batoning all that wood up in Alaska. In the African episode, he's using believe it or not the United Cutlery's original First Blood 1 survival knife knock off that they were famous for making since the 1990's.
Too bad Les didn't know the United Cutley lost the rights to manufacture the Rambo knives and that they're fast becoming a hight priced collectable. Here's mine with a custom made Rambo First Blood 1 sheath which was made from the original specifications along with stone..
Cheers,
Serge