Law enforcement officers and public safety officials join the procession into St. Patrick's Cathedral before the Blue Mass on Tuesday.
A slow, solemn procession of officers in their full-dress uniforms made their way into the St. Patricks Catholic Church in downtown Washington.
Firefighters, police officers, sheriffs, FBI agents and other local and federal branches of law enforcement joined the procession for the Blue Mass -- 25 different law enforcement agencies in all from the D.C. area.
Some of the officers may have even responded to the 9/11 attacks at the Pentagon a decade ago. The news of Osama bin Laden's death may carry its own significance, but the men and women in uniform gathered to pay tribute to and remember the officers that died in the line of duty.
A total of 19 law enforcement officers from the D.C. area died in 2010, including police officers, a coast guard officer and border patrol agents.