2011 Afghanistan Boeing Chinook shootdown 2011 Afghanistan Boeing Chinook shootdown On 6 August 2011, a U.S. CH-47D Chinook military helicopter operating with the call sign "Extortion 17" (pronounced "one-seven") was shot down while transporting an Immediate Reaction Force attempting to reinforce a Joint Special Operations Command unit of the 75th Ranger Regiment in the Tangi Valley in Maidan Wardak province, southwest of Kabul, Afghanistan. The resulting crash killed all 38 people on board - 25 American special operations personnel, one pilot and two crewmen of the United States Army Reserve, one pilot and one crewman of the United States Army National Guard, seven members of
Chinook (draughts player) or fewer. The linear handcrafted evaluation function considers several features of the game board, including piece count, kings count, trapped kings, turn, runaway checkers (unimpeded path to be kinged) and other minor factors. All of Chinook's knowledge was programmed by its creators, rather than learned with artificial intelligence. Chinook (draughts player) Chinook is a computer program that plays checkers (also known as draughts). It was developed between the years 1989 to 2007 at the University of Alberta, by a team led by Jonathan Schaeffer and consisting of Rob Lake, Paul Lu, Martin Bryant, and Norman Treloar. Chinook is the first