On August 6, 2011, a U.S. Army CH-47D Chinook helicopter approached a landing zone in Afghanistan 40 miles southwest of Kabul. The helicopter, call sign Extortion 17, was on a mission to reinforce American and coalition special operations troops. It would never return. Insurgents fired at the Chinook, severed its rear rotor blades, and brought it crashing to the ground. All 38 on-board perished instantly in the single greatest moment of sacrifice for Americans in the war in Afghanistan. In The Final Mission of Extortion 17: Special Ops, Helicopter Support, Seal Team Six, and the Deadliest Day of the U.S. War in Afghanistan, Ed Darack uncovers the truth behind this mysterious tragedy. His account of the brave pilots, crew, and passengers of Extortion 17 and the events of that fateful day is interwoven into a rich, complex narrative that also discusses modern joint combat operations, the history of the Afghan war to that date, U.S. helicopter use in Afghanistan, and the new and evolving military technologies and tactics being developed to mitigate such tragedies now and in the future.