Alexis attributed his mental-health issues to his assignment in cleaning up contaminated debris at the 9-11 Ground Zero site, but the Navy claims no such record of this work. A report in British paper Daily Mail notes Alexis was seen exiting a subway near the World Trade Center just as the twin towers were collapsing. The sight, it says, quoting Alexis' father-in-law, left him "traumatized." Indeed, the career of Alexis runs parallel to the 9-11 era, when thousands of servicemen were assigned to secret combat missions that do not appear on their military records.