Should civil servants be given banners and commendations from their units?

Sending a banner to the police is a way of thanking them.

There is no reward. This is purely voluntary. No one is forcing you to send banners, but under normal circumstances, people will use this method of sending banners after getting some help. To express gratitude to the police, only sending banners to these public officials can be done, which is also a kind of recognition of such public officials.