Different versions of the MI-17 helicopter are designed specifically for high-altitude military operations and are in service in the mountains of Afghanistan.

MI - 17直升机的不同版本专门为高海拔军事作战而设计，并在阿富汗的山区服役。

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Mi-17, entered service in 1975, is the highly improved Mi-8, with more powerful engines for 'hot and high' conditions.

米-17是米-8的深入改进型号，为提高高海拔高温性能，采用了更加强大的发动机，于1975年开始服役。

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Ten Mi-17-V5 helicopters were delivered to the Afghan Air Force (AAF) by December 2010.

FORBES: Sorry Congress, Defense Dept Sticking With Russian Helicopter Deal

There are around 20, 000 Mi-17 helicopters in circulation, including in Iran, Thailand, Malaysia, Colombia, Pakistan and Venezuela.

FORBES: Sorry Congress, Defense Dept Sticking With Russian Helicopter Deal

The Army has indicated that the procurement of additional Mi-17 for the Afghan military may be required, with Gregory telling Ria Novosti that it is up to 30.

FORBES: Sorry Congress, Defense Dept Sticking With Russian Helicopter Deal