BBC News Online remembers some key moments in the force's past.

Civil rights marchers faced RUC strong arm tactics

Use of plastic bullets by the RUC and the security forces has been a source of tension

Policing Dumcree has been a regular and difficult duty

RUC police stations had to be fortified

The Queen presents the RUC with the George Cross

RUC facing attack from rioters of both communities

Officers escort girls to the Holy Cross School, 2001

Sir Ronnie Flanagan: Current chief constable

Changes ahead: An officer holds the reform plan