Always acknowledge the call, if sent by dispatch, notify them and clarify that you are responding. If notified by the emergency dispatch system, then let everyone be aware in the government radio that you will be responding.

When you have arrived on the scene, alert dispatch and your colleagues that you have arrived on the scene.

Generally, unless designated, the first officer on scene will always be the Officer in Charge (OIC).

It is the responsibility of the OIC to keep dispatch and/or other officers informed of the situation unfolding and getting any suspects back to the Police Station.

If the first officer on scene is not a Corporal and a Corporal or higher arrives on scene, they should take over as OIC. Tactical Firearms Incident Commanders (TFIC) always assume the role of OIC when responding to shootouts.

Supervisors may take over as OIC (if ranked higher than current OIC) and must inform officers on scene that they are doing so.

The initial OIC will assist them in any way they can and provide an up-to-date status.

The Officer in Charge (OIC) is responsible for the overall management of the incident, including coordinating with other officers. This means all communication regarding the incident should be directed to the OIC, and all officers should follow the OIC's instructions. 

Officers assisting in the incident must not make decisions that would interfere with the OIC's management of the incident. If an officer has information or suggestions that they believe are relevant to the incident, they should report it to the OIC, who will then decide how to proceed. 

The only acceptable reason to interfere with the OIC is if their decisions would undoubtedly constitute a Law or Policy violation or that their decisions aren't in the best interest of the PD or general public.