Thousands came out to the US Capitol on Monday for the National Peace Officers Memorial Service.
The names of 144 law enforcement officers killed last year were read aloud.
They've also been added to the National Law Enforcement Officers Memorial.
The ceremony caps off National Police Week, which also included a candlelight vigil and memorial bike ride.
President Trump gave the keynote address where he said he will always support police officers.
"Though your loved ones left us much too soon, the memory of their courage will live on forever. To see so many names together is to see only a small glimpse of the debt America owes to those who protect our cities and police on our streets."