My great, great uncle served in World War II, and I recently found his discharge papers. I need some help!!

His information:

Claude W. Burrell
34428497, Private Company "C", 337th Infantry, Camp Shelby, Mississippi

Reason for Discharge: Conv. of Gov't at EM's request, per Sec. II WD Circular #39 dated February 4, 1943 & 3rd Indorsement, Hq 85th Inf. Div. Camp Shelby, Mississippi, dd March 18, 1943

I would like to know what the reason means.

Thank you in advance for your time and effort!! All information is appreciated!