Who is the only member of the chain of command who is an NCO (S.C.)?

• A. SFC Brown
• B. SGT Carter
• C. DS Smith
• D. CPT Evans

Answer: (C)

NCO (S.C.) points to the non-commissioned officer who carries that specific designation in the chain of command. The drill sergeant is the NCO type equipped with the DS role, which matches the NCO (S.C.) tag described in the question. Among the people listed, the drill sergeant is the only one whose role includes that designation, while the sergeant and the sergeant first class are NCOs without the SC qualifier, and the captain is a commissioned officer. So the drill sergeant, DS Smith, is the correct choice.