Which question is not part of the movement timing requirements?

The choice regarding the mode source of the mobility bags being shipped is not part of the movement timing requirements because movement timing focuses primarily on the logistics of transport rather than the specifics of the items being moved. Movement timing requirements are concerned with the planning and execution of the departure and arrival processes, including where the movement will commence and terminate (such as identifying the Aerial Port of Embarkation), as well as the nature of the transport (military station vs. international airport).

Understanding the specific details about the mode source of mobility bags does not directly influence the timing or logistics of the movement itself. Rather, it is an operational detail that may be relevant in other contexts but is not essential for determining when or how to move personnel or equipment according to established timing protocols. Therefore, this choice correctly identifies a detail outside the scope of timing requirements.