When command is transferred, then all personal involved in the incident should be told

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

Explanation:

The effective time and date of transfer of the command is essentially be told to the personnel involved in the incident as and when the command is transferred. Because they must be aware of the transfer in order to avoid misunderstanding of the current and previous command.

So that the chain of command remains integrated and not violated. The process of command transfer itself includes the briefing of the command involving all the personnel, but as the same in concern becomes secondary to action as primary being foretold to be the effective time and date.