What is the right souvenir gift for the traffic police's 20th anniversary?

Being a traffic policeman is a very hard job, especially for those old frontline traffic policemen who braved the heat in summer and the cold in winter. It is not easy to work for decades. Generally speaking, for those who have been engaged in this business for a long time, the state allows units to customize such souvenirs as honorary prizes for old traffic police. Prizes can be engraved with police badges, working years, names, etc.