What activity is performed at the furthest point downstream of a Bivouac?

The correct answer is washing vehicles. At a bivouac site, the farthest point downstream is typically designated for activities that involve managing waste or water runoff to minimize contamination in the main areas of activity. Washing vehicles is a task that can create runoff containing dirt, grease, and other contaminants that could potentially pollute the camp's water supply or affect the area where people are stationed.

By positioning vehicle washing at the downstream location, the military ensures that any pollutants are carried away from the primary living and operational areas. This practice not only maintains cleanliness but also adheres to environmental considerations, aligning with sustainable field operations. Other activities such as setting up tents, gathering firewood, and cooking meals would generally occur closer to the main living areas to promote efficiency and safety.