At 2:38 a.m. on August 6, 2011, a U.S. Army Chinook helicopter, call sign Extortion 17, entered the western opening of Afghanistan's restive Tangi Valley, flying alone. "One minute—one minute," transmitted Bryan Nichols, the pilot in command of the helicopter. Flying 250 feet above the valley floor at just under 70 miles per hour, Dave Carter, the pilot to the right of Nichols, guided the helicopter toward a carefully chosen landing zone just over a mile away. In the rear of the aircraft, the Chinook's passengers stood and prepared to storm out into moonless night once the wheels touched the ground. Extortion 17, however, would never reach that landing zone.

Hours earlier, pilots Carter and Nichols and crewmembers Specialist Spencer Duncan, Sergeant Pat Hamburger, and Sergeant Alex Bennett, along with pilots and crew of a sister Chinook, Extortion 16, inserted a strike force in the central Tangi Valley. Composed primarily of members of the 75th Ranger Regiment, which falls under the authority of the secretive Joint Special Operations Command, or JSOC, the team sought to capture or kill a powerful insurgent leader, Qari Tahir, known to coalition forces by his designation "Lefty Grove." Some of the most highly trained and skilled war fighters in history, the Rangers moved overland to a location where intelligence indicated Lefty Grove and his small cadre of fighters would be holding a meeting.

When they arrived at the compound, however, the strike force couldn't locate Tahir, and some of his fighters dispersed. JSOC and aviation commanders, prepared for virtually any outcome, quickly formulated a plan: they would send a team on one helicopter to bolster the Ranger-led force. Members of Navy SEAL Team Six formed the core of the IRF, with other American special operations personnel and highly-vetted Afghans playing integral roles. They loaded onto Extortion 17, and then Carter and Nichols lifted the Chinook into the night sky.

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A CH-47D Chinook helicopter lands at a small landing zone at Firebase Blessing, in eastern Afghanistan’s restive Kunar Province at the start of a combat operation. Ed Darack

Just after entering the Tangi, as Extortion 17 continued to descend and decelerate toward its landing zone, the helicopter passed through the narrowest portion of the valley. What the men on the Chinook didn't know was that cloaked by darkness, two fighters had emerged from the small village of Hasan Khel, on the south side of the valley. Each shouldered a rocket propelled grenade launcher, aimed at the dim silhouette of the approaching helicopter then fired. A volley of three rockets total sped toward the general direction of the approaching Chinook, all launched within a few seconds of each other.