Today, the US Government Accountability Office announced its response to the the National Defense Authorization Act for Fiscal Year 2010 (Pub. L. No. 111-84), which required GAO to submit a report on rare earth materials in the defense supply chain to the Committees on Armed Services of the Senate and House of Representatives by April 1, 2010.
The full text of the report can be found here:
http://www.gao.gov/new.items/d10617r.pdf