Early in the book when describing his UDT experience he says this:
My question is do Rangers still go to BUD/S (what UDT training became)? Is this something that a Ranger would do already having gone through Ranger School? What lessons learned in BUD/S would carry over into life at Regiment?One-hundred and twenty-one of us started it together as members of UDT class 26. Twenty-four survived - 20 percent. Many of those who washed out were so-called SpecWar experts: Green Berets and Army Rangers who wanted to get some maritime training.