IACs are formal organizations chartered by the DoD to facilitate utilization of existing scientific and technical information. The IACs are staffed by experienced technical area scientists, engineers, and information specialists. They establish and maintain comprehensive knowledge bases which include historical, technical, scientific, and other data and information collected on a worldwide basis. The information they maintain includes a wide range of valuable information pertinent to their respective technical communities. IACs also collect, maintain, and develop analytical tools and techniques including databases, models, and simulations. There are thirteen Defense Technical Information Center (DTIC) funded IACs. These are contractor operated and administratively managed by Office of the Program Manager, DoD Information Analysis Centers.