HOUSE INTERNATIONAL RELATIONS SUBCOMMITTEE HEARING ON "WEAPONS OF MASS DESTRUCTION: CURRENT NUCLEAR PROLIFERATION CHALLENGES."

William Tobey, deputy administrator for defense nuclear proliferation at the National Nuclear Security Administration, Energy Department, testifies before a House International Relations subcommittee hearing examining the threat of nuclear proliferation on September 26, 2006, on Capitol Hill in Washington. (UPI Photo/Kamenko Pajic)