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Established by Congress to investigate and expose government waste, the Commission on Wartime Contracting in Iraq and Afghanistan has decided to not reveal its volumes of materials to the public for another two decades.

After three years of work, the commission officially shut down last week, having concluded that the U.S. misspent between $31 billion and $60 billion in contracting for services in Iraq and Afghanistan.

But it won't allow its records to be opened for public review at the National Archives until 2031, because some of the documents contain "sensitive information," according to one official.

Steven Aftergood, an expert on government secrecy at the Federation of American Scientists, told The Wall Street Journal that the 20-year term "seems like a long period of time, particularly for a commission whose whole purpose is to improve accountability and expose waste."