警官

How it works

は (topic) marks 私(わたし) (I) as the topic — “as for me…”. The sentence ends with the plain copula だ (am), the casual counterpart of です (is), so this is something you'd say among friends rather than in a formal setting. Notice there's no separate verb: だ (am) alone links the topic to 警官(けいかん) (police officer).