"The Navy Expeditionary Supply Corps officer program is designed to recognize significant contributions made by Supply Corps officers while serving in operational expeditionary billets. Navy Expeditionary Supply Corps officer qualification represents a level of expeditionary knowledge that distinguishes an officer of the Supply Corps from his or her peers. The Navy Expeditionary Supply Corps officer qualification program is mandatory for all Supply Corps officers serving in designated billets as determined by Commander, Navy Expeditionary Combat Command (COMNAVEXPDCMBTCOM) and Commander, Naval Special Warfare Command (COMNAVSPECWARCOM). Commanders and above with other Supply Corps professional qualification (e.g., Naval Aviation Supply Corps officer or Surface Warfare Supply Corps officer) may elect not to participate, but Navy Expeditionary Supply Corps officer qualification is encouraged for these officers."