Robert McDonald never held the rank of First Sergeant.

First Sergeant

World War II First Sergeant rank insigniaKorean War First Sergeant rank insignia

In World War II and Korea the enlisted rank of First Sergeant consisted of three chevrons, three arcs, and a hollow diamond. The Pay Grade for a First Sergeant in World War II was E-1. During the Korean War a First Sergeant's Pay Grade was E-7.

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