Which physical demand of combat requires lower body strength and stamina?

The physical demand of combat that most clearly requires lower body strength and stamina is carrying wounded Marines to safety. This task involves significant physical exertion, as it requires the individual to lift and transport someone who may weigh considerably more than their own gear. Carrying a heavy load over potentially uneven or challenging terrain engages the legs and core muscles, making lower body strength essential.

In addition to strength, stamina is crucial in this scenario, as the individual must maintain effort over time while navigating to a safe location. This can involve running, walking quickly, or moving in a way that conserves energy but is still effective in a high-stress situation.

While climbing high obstacles does require lower body strength, it is more focused on the ability to propel oneself upward rather than carrying an additional load. Handling large-caliber ammunition may require upper body strength and coordination but is not primarily a demand on lower body strength or stamina. Performing maintenance work typically involves fine motor skills and mental focus more than it does intense physical exertion of the lower body. Thus, carrying wounded Marines is the most appropriate choice in this context.