The armored trucks, televisions, ice cream scoops and nearly everything else shipped to Afghanistan for the U.S. war against the Taliban are now part of the world's biggest garage sale: Every week, as the American troop drawdown accelerates, the U.S. is selling 5.4 million to 6.4 million kg of its equipment on the Afghan market.

Returning that gear to the United States from a landlocked country halfway around the world would be prohibitively expensive, according to American officials. Instead, they're leaving behind $7 billion worth of supplies, a would-be boon to the fragile Afghan economy.

But there's one catch: The equipment is being destroyed before it's offered to the Afghan people — to ensure that treadmills, air conditioning units and other rudimentary appliances aren't used to make roadside bombs.