While I have served in the military and I think their survival schools are top notch for what they teach, they are first and foremost Escape and Evasion schools for folks behind enemy lines.
Very little time is spent on surviving for extended periods in the bush. The reason for this is obvious- you cannot perform mission essential tasks and worry about providing for your sustenance. That is why they airdrop rations to forward units.


In the case of the Spetznaz, where part of the training is a long distance forced march with very limited provisions, I would probably say that I could look to someone who underwent that training as a viable information source.

Graduating from Ranger school obviously puts you in a category of its own. I doubt because you ate a snake in training you are an expert. I've eaten snake a few times myself and don't even pretend to be an expert.