Based on the premise 'As this exchange shows, Secretary Rumsfeld was not in the NMCC when the shootdown order was first conveyed.', does it logically lead to the hypothesis 'The shootdown order was conveyed before Secretary Rumsfeld was there.'
As this exchange shows, Secretary Rumsfeld was not in the NMCC when the shootdown order was first conveyed.###The shootdown order was conveyed before Secretary Rumsfeld was there.