'In 2002, Which Secretary Of Defence Explained About ''Known Knowns'', ''Known Unknowns'' And ''Unknown Unknowns'' In An Infamous Speech Referring To Terrorism?'

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1. 'In 2002, Which Secretary Of Defence Explained About ''Known Knowns'', ''Known Unknowns'' And ''Unknown Unknowns'' In An Infamous Speech Referring To Terrorism?'