It’s very difficult to compare numbers between countries like this because of different definitions. In the US are INS or FBI agents cops, what about secret service agents dealing with counterfeiters or protecting the president? How about dispatchers etc. This is why you will see wildly different number of how many cops there are in the US generally it’s between 600k and 1 million but there’s many different counts.

Similarly the US often uses firefighters as EMS personnel while other countries lean on police officers.