Answer The General Service Corps' main function was to act as a holding unit for Officers and specialists who have not been assigned to other units or corps; these are primarily reservists. The GSC is usually only active in wartime. Their cap badge is simple the English crest with the Lion and Unicorn.
it means world wide service.
Army Service Corps
Womens Volunteer Service Corps - Canada
US Army Air Corps
the peace corps.
Any British General? General Bernard Law Montgomery
General Montgomery
Major General George Barnett (1914-1920).
B, D, and E
Perhaps the Fifth and Sixth Marines because of their service in World War One,
Selective service system
I think it may have been Jimmy Doolittle. It was General Henry Harley "Hap" Arnold.