It's old, but worth reinserting into the mix while we're all aflutter about Iran:

Larisa Alexandrovna
Published: February 13, 2006

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The unmasking of covert CIA officer Valerie Plame Wilson by White House officials in 2003 caused significant damage to U.S. national security and its ability to counter nuclear proliferation abroad, RAW STORY has learned.

According to current and former intelligence officials, Plame Wilson, who worked on the clandestine side of the CIA in the Directorate of Operations as a non-official cover (NOC) officer, was part of an operation tracking distribution and acquisition of weapons of mass destruction technology to and from Iran.

Speaking under strict confidentiality, intelligence officials revealed heretofore unreported elements of Plame's work. Their accounts suggest that Plame's outing was more serious than has previously been reported and carries grave implications for U.S. national security and its ability to monitor Iran's burgeoning nuclear program.