This article, in its entirely, is available at "Danger Room" Copter Crashes Reveal Achilles’ Heel of Afghan War
By Noah Shachtman 
Afghanistan is a country the size of Texas, with only a handful of major roads. So when the U.S. military wants to haul gear, supply isolated outposts, reposition forces, or evacuate wounded troops, the first, best and sometimes only option is to do so by helicopter.
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In the 1980s, the U.S. famously supplied Afghan militants with Stinger missiles that began to threaten the Soviets’ helo fleet at risk. It drove up the cost of operating in Afghanistan, and contributed to the Red Army’s eventual defeat.
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Even if more military helicopters are sent to Afghanistan, there’s a much bigger issue: Operating rotary aircraft in Afghanistan can be extremely difficult.
Earlier this year,
Popular Mechanics reporter Joe Pappalardo spent some time with the wrench-turners who keep the helicopters flying in Afghanistan. “Afghanistan,” he concluded, “
is hell on helicopters.” Here’s a list of just a few of the things he noted that can go wrong: Temperature extremes that destroy seals and gaskets; “high/hot” flying conditions that reduce engine performance; dust and sand that ruin rotor blades and clog up hydraulics. And, of course, there’s the enemy. (Soviet helicopter operations were also vulnerable, albeit for a different reason: The delivery of the Stinger missile, courtesy of the United States.)
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Add to that a number of other factors — low-light conditions, flying under night-vision goggles, sudden dust swirls, enemy ground fire — and you’ve put one of the centerpieces of this war at even greater risk.
– Nathan Hodge and Noah Shachtman
(Photo: US Department of Defense)
My understanding from other reading is that things like elevation of the country (relative to sea level), air density, etc., also affect the physics of rotary aircraft; adding one more danger.
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