.. For 18 years Valerie had kept her occupation a secret. She worked under the cover of a CIA front company created and maintained at the taxpayer's expense, and all of that was destroyed by Bush administration officials at the highest levels when they leaked her identity ..
.. Melissa Mahle spent 14 years as a covert CIA agent maintaining a series of fictitious cover stories, invented by her superiors. On the October 30, 2005, segment of 60 Minutes, Mahle reported that Valerie was working on important national security issues, like keeping tabs on nuclear material and the world’s top nuclear scientists ..
.. It is now known that Valerie was monitoring Iran's nuclear activities. According to Raw Story investigative reporter, Larisa Alexandrovna, former intelligence officials, have said that Valerie "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."
"The revelation that Iran was the focal point of Plame's work," Alexandrovna wrote, "raises new questions as to possible other motivating factors in the White House's decision to reveal the identity of a CIA officer working on tracking a WMD supply network to Iran, particularly when the very topic of Iran's possible WMD capability is of such concern to the Administration" ..
http://www.bestsyndication.com/Articles/2006/p/pringle_evelyn/05-06/051106_rove_indictment.htm