hi! there's room for more input on this, but you may find some interesting responses in these related posts:

• Why do ceremonies for police and fire departments across the US feature Gaelic music and dress?

and in case you're referring to bagpipes in parades, etc:

• How did bagpipes and pipe bands become so closely tied in to police departments and fire brigades?

• How did bagpipes become such a common symbol for funerals of police, firefighters and other public figures in the US?