Reading the book now.
13 Hours: The Inside Account of What Really Happened In Benghazi [Kindle Edition]
Mitchell Zuckoff with the Annex Security Team (Author)
Update at 2254
In the book, Bob comes off worse than useless. He held up the team that finally went to relieve the consulate compound without permission. Later, he was sitting in the hallway, head in hands. After being relieved his duties, first by the Annex Team Leader and later by the Tripoli security chief, the Daily Beast reports that he received a "prestigious intelligence service medal"!
IMO, the book is credible. The seven "operators" acted heroically whereas the most of the CIA and both of the Delta Force "D-boys" were primarily spectators. This sounds a little one-sided but in the Fox News special, the three operators were quite believable. Book is well written and easy to read.