Daniel J. Hill joined the US Army at the age of 15, by lying about his age. He eventually became a Special Forces paratrooper and served in Germany....In 1960 he was assigned to infiltrate the Katanga insurrection in the Congo where he met his lifelong friend, Rick Rescorla.... Rescorla had become Director of Security for Dean Witter Securities (later merged with Morgan Stanley), which occupied a number of floors in the World Trade Center. Rescorla had become increasingly concerned about the potential for a terrorist attack against the center and in 1990 hired Hill to provide an assessment of the...