Since President John F. Kennedy designated May 15 as Peace Officers Memorial Day in 1962, police and other law-enforcement agencies have used the month to honor members killed in the line of duty.

On May 4, the names of Nassau Officers Joseph Olivieri and Arthur Lopez were added to a memorial in Hicksville, and then on Wednesday to a state marker in Albany. Olivieri was hit by an SUV on Oct. 18 while responding to a Long Island Expressway accident. Five days later, Lopez was shot by an ex-convict near the Nassau-Queens border. The name of a third Nassau officer, Charles D. Cole Jr., was also added to the Albany wall after he died in 2011 of a cancer attributed to working at Ground Zero.

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The tributes go on. This week their names will be engraved into the National Law Enforcement Officers Memorial in Washington.

The pain and gratitude these memorials inspire should remind us -- and not just one month a year -- to remember and thank those who protect us.