The massive disposal effort, which US military officials call unprecedented, has unfolded largely out of sight amid an ongoing debate inside the Pentagon about what to do with the heaps of equipment that won't be returning home, the Washington Post reported.
Military planners have determined that they will not ship back more than USD 7 billion worth of equipment - about 20 per cent of what the US military has in Afghanistan - because it is no longer needed or would be too costly to ship back home.
The destruction of tonnes of equipment is all but certain to raise sharp questions in Afghanistan and the US about whether the Pentagon's approach is fiscally responsible and whether it should find ways to leave a greater share to the Afghans, it added.
"We're making history doing what we're doing here...This is the largest retrograde mission in history," Maj Gen Kurt J Stein, head of the 1st Sustainment Command, who is overseeing the drawdown in Afghanistan, was quoted as saying.
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The US Army owns the lion's share of the military equipment currently in Afghanistan.
As of May, USD 25 billion worth of equipment was deployed with Army personnel. After an analysis of needs and costs, it has decided to ship back no more than 76 per cent.
Transporting that much will cost USD 2 billion to USD 3 billion, the Army estimates. And repairing the gear that comes back will cost USD 8 billion to USD 9 billion, the report said.