Haze, I got to enjoy a fun vacation at Ranger School, Benning, north GA mountains and most delightful parts of wonderful Florida, a loooong time ago! Hate to say how long. All I can say it was your basic mofo. I seem to recall we had about a 70-80% washout rate, fairly similiar to what you recall. Also, I agree the biggest single cause was injury.
Cal - I was just a plain old-fashioned Army grunt, not an officer, so I can't tell you about Marine office candidate school (I think they still call the Marine version Platoon Leader Scool, don't they?)From what I hear (my dad went thru Army OCS and I think its pretty similiar) its more mind games and constantly running your ass off all day long - not so much as actual "running", although you'll do a lot of that - but making you gallop full tilt from one thing to another about 18+ hours a day, and trying to just wear you down. Just hang in there, don't let the BS get you, and you should do fine. It is a totally different thing from any of the "elite" schools, like Ranger, SF Q Course, Recon or Seals, like everybody else said. Definitely comparing apples and oranges to try to compare.
Chuck