From Longman Dictionary of Contemporary Englishpolice forcepoˈlice force noun [countable] SCPthe official police organization in a country or area Jones joined the police force in 1983.
Examples from the Corpus
police force• Time allowed 00:11 Read in studio A police force is testing a laser speed detector.• Bill Foley of the UC-Berkeley police force was one of the first to respond.• The Houston police force was beset by charges of racism and brutality.• Ferdinand resigned from the police force last May.• The Lawson brothers retired from the police force in January.• The police force inherited by Nicholas was small, corrupt and ill-trained. 