Name one operational advantage of indirect fire.

Engaging targets without direct line of sight represents a significant operational advantage of indirect fire. This capability allows artillery or mortars to strike enemy positions that are obscured by terrain or other obstacles, thus allowing for effective engagement of the enemy without exposing the firing unit to return fire. This aspect enhances the survivability of the firing unit and allows for greater tactical flexibility, as forces can utilize terrain to their advantage while still delivering effective fire support.

In contrast, the other options focus on different aspects of operational utility but do not capture the essence of indirect fire's fundamental advantage as well. While quick repositioning, minimizing ammunition usage, and hitting moving targets are valuable operational considerations, the ability to engage through cover and from a position of safety is central to the effectiveness of indirect fire in a military context.