i was stationed at ft Leavenworth for a few years and delta force came to the base looking for some guys who would be interested in joining there outfit.
I went to the class and listened to what they had to say and i new it wasn't for me. A bunch of guys on the base where interested so delta force had them in the base pool with fool gear and they had to swim so many times back and forth. Not one guy made it. This was just one of the many tests they where going to have to go threw just go to ft Bragg and go threw there training.
they said for the guys that make it from the permanent duty station and go for the training the drop out rate was over 90%.