The Defense National Stockpile Center (DNSC) is a branch of the United States' Defense Logistics Agency, whose purpose it is to store, secure, and sell raw materials. The DNSC is based in Fort Belvoir and has operations throughout the United States. Materials they offer for sale include: aluminum oxide, beryllium, chromium, cobalt, diamonds, ferrochromium, ferromanganese, iodine, iridium, mica, niobium, platinum group metals, talc, tantalum, thorium, tin, tungsten and zinc.