What is a key advantage of drag litters compared to drag harnesses?

The key advantage of drag litters over drag harnesses is that drag litters decrease friction, making it easier to move the casualty. When utilizing a drag litter, the design and structure allow for a smoother, more even surface on which the casualty can be transported. This reduces the resistance encountered when dragging the litter across various terrains. The engineering of drag litters can include features such as a smoother underside or additional materials that minimize friction, thereby facilitating quicker and less strenuous movement of the casualty.

This is particularly important in combat or emergency situations where time and efficiency are critical. A lower friction coefficient means that medics or rescue personnel can exert less force, reducing physical strain and improving their ability to transport the casualty over longer distances or more challenging environments.

Other options may reference aspects like cost, weight, or ease of carry, but they do not capture the unique functional advantage that drag litters provide in terms of friction reduction, which directly impacts the effectiveness of casualty movement.