A Blue Mass is a Mass celebrated annually throughout the United States in the Catholic Church for those employed in the "public safety field" (police officers, correctional officers, 911 operators and EMS personnel). The color blue relates to the blue-colored uniforms predominantly used by these services. The service honors those who have died in the line of duty and those currently serving as first responders. The Mass is an opportunity for the community to show gratitude to first responders and their families.