I was not an Infantry guy, so I have not idea about that. I do know logging an commercial fishing, and yes, lots of high calorie food is necessary to work in those extreme conditions. 10K would be about right, although we never counted calories.
Being in the infantry is not the same as working in extreme conditions 6 days a week year round and some times 24/7.
End of discussion.
“ 10k would be about right”
LOL! No, it really isn’t. You’re just guessing.