Ryan J. Connolly, 24
Connolly, then 17, watched television on Sept. 11, 2001, as a man slowly climbed out a window at the World Trade Center, dangling by a power cord until he fell. Two years later, in New York for an uncle's wedding, Connolly visited the site. He enlisted in the Army within months.
Sources: Times research, Defense Department, iCasualties.org