When Gen. Stanley McChrystal took charge of the U.S. Joint Special Operations Task Force in 2003, he recognized that traditional tactics of warfare were failing in Iraq. Leading this inter-service team — which included Army Rangers, Navy SEALs, and Delta Force — he needed to find new ways to disrupt Al-Qaeda and get these disparate branches of elite U.S. soldiers to work cohesively. In the new book Team of Teams, McChrystal describes the lessons he learned (and applied) in Iraq and Afghanistan, as well as research and examples from other fields (including sports, aviation, and emergency medicine) on how teams have learned to work more effectively. (The book is co-authored by his colleagues Tantum Collins, David Silverman, and Chris Fussell.)