'The Way of the Knife' by Mark Mazzetti: chapters 7-13
JSOC put on a show for the visiting defense secretary. To demonstrate its ability to insert commandos into countries undetected, soldiers parachuted out of a plane and landed right in front of Rumsfeld. One of them, wearing a suit and carrying a briefcase, shed his parachute and walked away from the landing zone in his wingtip shoes. Rumsfeld was also taken to a "shoot house, where he watched a practice hostage-rescue operation—the JSOC operatives pretending to kill off all hostage-takers without harming the captives. Rumsfeld was immediately sold.
Mark Mazzetti, The Way Of The Knife