Patrol dogs are trained and employed as an aid to the Security Officer/Police, Infantrymen, etc. For Security Officers, a Grade C is required, and if employed for Rapid/Armed Response, the Officer should be trained alike.
The purpose of the dog is to assist the Handler with a successful arrest through search and find.
The scenario may vary from bushy terrain, building and open areas. The dog may work off-leash under the control of it handler to follow-up and find suspects that fleas, or resist and arrest.