Final answer:
Delegation of authority in dental logistics to request and receive items is typically done d) as needed, rather than on a fixed schedule such as biweekly, monthly, or annually.
Step-by-step explanation:
The delegation of authority from the dental logistics noncommissioned officer in charge (NCOIC) to the supply custodian for requesting and receiving items from medical material should be submitted in the format that best fits the operational tempo and needs of the unit. While there is no universal frequency for all situations, delegation is typically done as needed to ensure that operations can continue seamlessly without delay. This means that the supply custodian will be granted the authority to perform these actions whenever it becomes necessary, without having to wait for a specific time frame, such as biweekly, monthly, or annually.
Therefore, the correct answer is D) As Needed.