Fetching details from the dictionary...

police officer; policeman; policewoman
警察官が交差点で交通整理をしています。
A police officer is directing traffic at the intersection.
困った時は警察官に相談しましょう。
When you're in trouble, let's consult with a police officer.
警察官になるのが子供の頃の夢でした。
Becoming a police officer was my childhood dream.