Special operations units will always attract people literally willing to die to get in or before they lose what they perceive to be a competition. I would know, as I was one of these people. I was with the 75th Ranger Regiment (2/75) for five years. The selection program at the time, Ranger Indoctrination Program ("RIP", now known as "RASP" these days), was basically a month-long PT-until-exhaustion hazefest. The first run we did on the first day of RIP in July Georgia heat was a 5+-mile run at a sprinting pace, and five people fell out due to heat exhaustion alone and were removed from the course. I was on the cusp of heat exhaustion, probably actually got it. But I wasn't going to quit - I literally committed myself to die before that happened. If I had a pulse, I was going to be a Ranger no matter what. This same attitude and a similar hot weather incident would nearly kill me almost a year later in Florida phase in Ranger school. I was a no-shit heat casualty, and I blacked out for a few hours. When I came to, I was told I was hyper aggressive with people, couldn't stand on my feet and was stumbling around, I cut holes into my uniform with my Gerber knife, and a Ranger Instructor forced me to submerge myself completely in a nearby stream. Nothing formally came of it, I graduated Ranger School, and always (and still do today) have to take special care of myself when it's hot. Running or hiking when it's 85+ degrees Fahrenheit outside is a nonstarter for me, and dizzy spells creep up pretty quick.
Not saying this to brag. This complete disregard for one's health to complete the mission and/or find glory is a common thread in special operations units. Jeff Struecker, a Ranger legend who was key player in the infamous "Black Hawk Down" incident in Somalia, recently said outright the Ranger mission is a suicide mission[1]. I was appalled when I first heard him say it so bluntly, but after some thought I think this is an accurate statement.
[1]: https://www.linkedin.com/company/legends-of-the-75th/videos/...