Address problems with parts, supplies, or equipment supplied to the military.

The , also known as a Request for Engineering Support , is a critical document used by Defense Supply Centers to request technical assistance from a Military Service Engineering Support Activity (ESA). These requests are generally used to:

As the DoD moves toward digital records requirements , multimedia formats are sometimes used to archive visual engineering data or reviews associated with a specific request. ESA - Engineering Support Activities - DLA

It may be a video recording of a system walkthrough, showing how to process a "339" request in a records management system.