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.

Based on that paragraph can we conclude that this sentence is true?
Orio Joseph Palmer was a firefighter for twenty years before he died.

Select from the following.
 *Yes;
 *It's impossible to say;
 *No;