Nightly News   |  September 21, 2010

Americans killed in Afghan chopper crash

The war in Afghanistan has been going on longer than World War II and the death toll continues to mount. Early today, nine Americans died in a pre-dawn helicopter crash. With three months left to go in 2010, this is already the deadliest year of the war for both coalition forces and for US troops. NBC's John Yang reports from Afghanistan.

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