My own experience:
1 n half year ago, I was in Mt Ophir area for a weekend. there were
military vehicles moving around the country roads there. I was with
a local friend climbing the mountain casually. on the way, met some
MAF soldiers training, they asked food or anything could eat from
us. during the talking, they had to finish climbing to top and then
down in 1 day. the "sir" didn't agree them to eat, so they were
extremely exhausted and hungry.
Judged from their strength of training, I believed they should
belong to elite force.