In a statement, CIA Director Michael Hayden said the decision to release the report was not his choice or preference, but that he was making the report available as required by Congress in a law President Bush signed earlier this month.
“I thought the release of this report would distract officers serving their country on the front lines of a global conflict,” Hayden said. “It will, at a minimum, consume time and attention revisiting ground that is already well plowed.”
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How in heck will the release of this report affect officers in the field, unless Congress plans to use it for more so-called “hearings”, of activities that took place six years ago.
IMHO the part of your question following 'unless' is the answer to the previous part.