The amount the U.S. military spends annually on air conditioning in Iraq and Afghanistan: $20.2 billion, according to a former Pentagon official. That's more than NASA's budget. When you consider the cost to deliver the fuel to some of the most isolated places in the world - escorting, command and control, medevac support - when you throw all that infrastructure in, we're talking over $20 billion," Steven Anderson tells ... All Things Considered. He's a retired brigadier general who served as chief logistician for Gen. David Petraeus in Iraq. The Pentagon rejects Anderson's estimate. Still his claims raise questions about how much the US footprint in Afghanistan really costs - especially something like air conditioning. To power an air conditioner at a remote outpost in landlocked Afghanistan, a gallon of fuel has to be shipped into Karachi, Pakistan, then driven 800 miles over 18 days to Afghanistan on roads that are sometimes little more than "improved goat trails," Anderson says. "And you've got risks that are associated with moving the fuel almost every mile of the way." Anderson calculates that more than 1,000 troops have died in fuel convoys, which remain prime targets for attack. Freestanding tents equipped with air conditioners in 125-degree heat require a lot of fuel.