A number of languages use Roman script, such as Vietnam and Indonesia, instead of Arabic or Chinese writing. More due to French and Dutch colonial rule. Like Iran, countries in the Middle East and Asia will often display native language with English.
Since France used to trade more with Iran under Chirac, uniform items could have come from France, where the spelling of ‘Police’ is identical to English.
Also, thanks for the vocabulary. I’ll try it on some Persians I know.
Yes, that is the obvious explanation. France has long had a healthy export business in military and para-military gear. The police shields and uniforms were undoubtedly from those French sources - perhaps even surplus hand-me-downs.