Final answer:
A lower-ranking soldier should walk to the left of a superior officer or NCO as prescribed by military protocol to signify respect for the hierarchy.
Step-by-step explanation:
When walking with an officer or non-commissioned officer (NCO) of superior rank, a lower-ranking soldier is expected to walk to the left of the superior-ranking officer. This military protocol helps maintain order and signifies respect for the hierarchy within the ranks. This tradition is deeply ingrained in military customs and courtesies and may vary slightly among different branches of service, but it is generally observed across the military forces.