High Quality Content by WIKIPEDIA articles! On 6 August 2011, a U.S. Boeing CH-47 Chinook military helicopter, call sign Extortion 17, was shot down while transporting a quick reaction force attempting to reinforce an engaged unit of Army Rangers in Wardak province, west of Kabul, Afghanistan. The resulting crash killed all 38 people on board—25 American special operations personnel, five United States Army National Guard and Army Reserve crewmen, seven Afghan commandos, and one Afghan interpreter—as well as a U.S. military working dog. It is considered the worst loss of life in the Afghanistan campaign, surpassing Operation Red Wings in 2005.