Which action must be taken before a trip document can be canceled by the AO?

Before a trip document can be canceled by the Authorizing Official (AO), the key action that must be taken is that the authorization must be signed. This is crucial because a signed authorization is a formal acknowledgment that the trip has been approved and allows for the necessary changes to be made, including any cancellations.

Without a signed authorization, the AO does not have the authority to make changes to the travel document. Therefore, it is essential that the authorization undergoes the signing process before any cancellation can be initiated. This ensures that all actions regarding the travel document are tracked and compliant with regulations governing travel management.

The other actions listed, although relevant in different contexts of the travel process, do not serve as prerequisites for the cancellation of the trip document. For instance, revising the authorization pertains to making changes to the content of the travel plans rather than directly addressing cancellations. Similarly, complete trips and refund requests relate to different procedural aspects of travel management.