Which document is used to officially record lost ammunition?

The correct document used to officially record lost ammunition is the DA Form 5811. This form is specifically designed for reporting lost, stolen, or damaged ammunition within the Army, ensuring proper accountability and a clear record for unit and inventory control. By utilizing this form, units maintain compliance with Army regulations regarding the management and reporting of ammunition discrepancies, which is critical for maintaining operational effectiveness and ensuring security protocols are followed.

On the other hand, while the other options serve important functions within Army logistics and operations, they do not specifically address the reporting of lost ammunition. The DA Form 4137 is typically used for the transfer of property, DA Form 3161 is a general equipment request or turn-in document, and DA Form 2058 is a used for personnel accountability, none of which are specifically focused on lost ammunition.