St. Florian is the patron saint of firemen...er, firefighters...er, first responders. The Brookline Fire Fighters page says:
Florian was a Captain in the Roman army. He was a brave soldier and a tenacious fighter. Rome recognized the danger of fire and was the first to employ a fire department. This first fire department was made up of slaves. They had no real desire to risk their lives battling the flames of their captors. Rome desperately needed fire protection. They called on Captain Florian to organize and train an elite group of soldiers whose sole duty was to fight fires. Captain Florian indeed organized such a group. They were highly trained and very successful at protecting Rome from fires. A brigade of firefighters followed the army and provided fire protection at their encampments. These firefighters were highly respected and easily recognized. They wore the traditional Roman soldier uniform except the skirt was green. The most famous picture of Saint Florian depicts him with a young boy pouring water from a pitcher onto a fire. This picture if seen in color reveals this green skirt.