It isn't the motto of every police department in the U.S., but the four words are known by people across the U.S.: "To protect and serve."
It's the motto of the Los Angeles Police Department and, according to that agency's website, it was coined in 1955 when Officer Joseph S. Dorobek entered it in an inter agency contest. Initially, it was the motto of the Los Angeles Police Academy, and in 1963 it was officially made the city police department's public mission statement.
Over the years, it has come to national prominence by being featured in any number of movies and TV shows about police, no doubt owing, in part, to Hollywood being within the greater Los Angeles...
Gomez was presented with this badge at his retirement ceremony Friday.