Premise: Orio Joseph Palmer (March 2, 1956 – September 11, 2001) was a Battalion Chief of the New York City Fire Department who died while rescuing civilians trapped inside the World Trade Center on September 11, 2001. Palmer led the team of firefighters that reached the 78th floor of the South Tower, the floor where the plane had struck the building.
Hypothesis: The New York City Fire Department had fifteen firefighters.