Final answer:
The authority for promoting individuals to the grades of SGT and SSG depends on the branch of service. In the Army, the promotion authority typically lies with the Army Human Resources Command (HRC) and promotion boards at various levels.
Step-by-step explanation:
The authority for promoting individuals to the grades of SGT (Sergeant) and SSG (Staff Sergeant) in the military varies depending on the branch of service. In the Army, the promotion authority for these grades typically lies with the Army Human Resources Command (HRC) and the promotion boards at various levels. The promotion process considers factors such as time in service, performance, and completion of required training.
For example, in the Army, promotions to the rank of SGT are typically authorized by the local unit commanders for soldiers in the grades of E-1 to E-4 (Private to Specialist). Promotions to SSG are authorized by the promotion boards at the unit and HRC levels for soldiers in the grades of E-5 and above (Sergeant and Staff Sergeant).