Explain the concept of "field training" for police officers. When does it begin and what is the primary purpose for the training?

"Field Training" is usually hosted after the Police Academy. For example if you take a look at the Los Angeles Police Department the officers in training are long sleeves with neckties. They are to be at a close watch of a T. O (Training Officer) which means that the T. O is to supervise them during a 10-95 (Traffic Stop), 10-32 (Backup Required) calls and evaluating their Code-3 (Lights and Siren) response. If there are shots fired during the course of the Field Training the Trainee is to act as a full rank officer and begin assisting and protecting him/herself and the Training Officer.