On Sept. 11, Army Chief Warrant Officer Craig Sincock arrived at the Pentagon a little after 4:30 a.m.--as usual. Sincock, a 57-year-old computer scientist, was soon to begin the daunting project of integrating the Army's thousands of computer networks. His wife of more than 24 years, Cheryle, worked two corridors down as the administrative assistant to a top Army official. It was Cheryle, 53, a 15-year veteran of the Pentagon, who pushed Craig to get to work so early, as she liked to make sure everything was perfect by the time her boss arrived around 6.
Shortly before 8, Craig took...