Todays crash was the 63rd helicopter to go down in Iraq, and 36 have been struck by enemy fire. In the first two months of this year, seven helicopters were shot down, killing 28 people. That spate of fatalities led to a reevaluation of flight plans and the implementation of new tactics the prevent anti-aircraft fire.
The crash on Wednesday was the most lethal in two and a half years. In January 2005 a CH-53E Super Stallion went down, killing all 31 on board.