September 11, 2001, was profoundly significant for New York City firefighters because it was the day of the terrorist attacks on the World Trade Center. The firefighters were among the first responders who rushed to the scene to conduct rescue operations amidst the chaos of two hijacked airplanes crashing into the Twin Towers. Tragically, 343 FDNY firefighters lost their lives that day, representing a tremendous sacrifice of experience, training, and bravery. Many firefighters, including high-ranking chiefs, entered the burning towers to rescue civilians and fellow responders, often losing their lives in the process as the towers collapsed. These heroics and sacrifices are remembered as defining moments of their courage and dedication, as they worked to save as many lives as possible under catastrophic circumstances.