Which unserviceable item tag is used on munitions that are not economical to repair?

The correct answer is the Department of Defense (DD) Form 1577, which is specifically designed to tag items that are unserviceable and not economical to repair. This form is part of the maintenance and supply chain management processes, serving as a clear indicator that an item has been evaluated and deemed beyond repair under standard economic considerations.

Using this tag ensures that personnel can quickly identify items that should not be expected to return to service due to the high cost of repair relative to replacement. This efficiency is crucial in munitions management, preventing unnecessary expenditure of time and resources on items that cannot be feasibly restored to operational status.

The other options do not fulfill this specific purpose; for example, Form 1569 is typically associated with return actions and other Issues, while Air Force Form 979 is used for maintenance discrepancies that need to be reported. The Quality Assurance Report, while it can document various quality issues, is not meant specifically for tagging unserviceable munitions indicating a decision against repair. Therefore, DD Form 1577 distinguishes itself by directly addressing unserviceability in the context of repair economics.