INDUSTRIAL CAPABILITIES Office of the Under Secretary of Defense for Acquisition and Sustainment Page 66: Other examples of strategic material supply chains tracked by DoD include high-performance aluminum and steel for ground combat vehicles and Navy ships, titanium and beryllium for military aircraft, tungsten for radars and communication systems, rare earths for guided munitions and computers, germanium for wafers and solar cells, and ceramics for body armor and microelectronics.  The Department also assesses risk for highly engineered synthetic material such as high-performance carbon fibers and their composite used in missiles, aircraft, and space.  In addition to innovations in newer classes of materials such as carbon nanotubes and additive manufacturing materials, innovations and other major improvements to existing materials and their processing are also significant Page 77: The Department is reliant on sole foreign sources for a variety of advanced materials such as carbon fibers and semiconductor materials.  An example of a potential risk that DoD has been working to mitigate against is sole foreign sources of unique and proprietary carbon fibers from Japan and Europe.  A sudden and catastrophic loss of supply would disrupt DoD missile, satellite, space launch, and other defense manufacturing programs.  In many cases, there are no substitutes readily available.  In order to mitigate this risk, DoD has been qualifying substitute materials into defense platforms as well as working with the material suppliers to create stockpiles of these materials. https://www.businessdefense.gov/Portals/51/Documents/Resources/2018%20AIC%20RTC%2005-23-2019%20-%20Public%20Release.pdf?ver=2019-06-07-111121-457