When command is transferred, then all personnel involved in the incident should be told what?

When command is transferred, all personnel involved in the incident should be informed of the effective time and date of the transfer.

The effective time and date of the transfer are critical pieces of information which ensures that everyone is aware of when the change in leadership occurs, maintaining the integrity and continuity of command throughout the incident management process. Such communication is essential for aligning all operational activities under the new Incident Commander’s direction, thereby minimizing any potential confusion and ensuring that the incident response efforts are cohesive and well-coordinated.

From the perspective of incident personnel, understanding when and why command is transferred, and knowing who the current Incident Commander is, are fundamental aspects of effective incident management.

Source: https://training.fema.gov/emiweb/is/is200c/english/instructor%20guide/is0200c%20ig.pdf