Yep true
Rangers and Navy seals are known to have very tough training, and frankly not everyone gets thru it all.
When I lived in Columbus Ga in 1995, 4 ranger candidates died from hypothermia while they were training at Eglin AFB. The instructors kept the exercise going on the Yellow river at the edge of acceptable conditions. It’s very tough training. God Bless all the men and women of the US Armed forces and their families.