Back when I was in the Army, there were these rusted-out hulks of metal containers called Conexes that littered the motor pools. We stored all kinds of crap in there. I remember being told that they weren't being made anymore and that we were lucky to have them.
Conexes are a shorter version of Milvans or Seavans. All of them used to be in high demand since the Army is famous for squirreling away all kinds of stuff, sometimes useful, most of the time not. Because the Army supply system was sometimes unreliable, every unit Supply Sergeant had a rat's nest of double secret supplies that could be called upon, if necessary. These supplies also made great trading material for other supplies and materials that a unit needed.
Even in Antarctica, Conexes and Milvans were in high demand, again to store and squirrel away all kinds of stuff where there was no other room for it. On the Ice, we stashed away cabling, tires, connectors, antennas, old radios, car parts, basically whatever folks thought they would need in an emergency -- but usually never did. As a result, all the stuff in these rusted, metal containers usually were covered with dirt, grime, dust, and other filth -- inches deep.
Not until I came to Kabul did I realize that these horrid things had other uses and capabilities. Here in Afghanistan, people live and work in them! They provide the raw building blocks for most of the new structures standing up here to meet the coming surge. When I see how many of these containers have come into country, it makes me wonder why I didn't see this earlier and bought stock in the company. It's probably not too late to get in on the next wave of profits.