In which scenario would target overkill typically occur?

Target overkill typically occurs when there is excessive force or firepower applied to a target that does not warrant such a response. In this case, wasting ammunition on minor threats exemplifies overkill because it highlights a scenario where the level of firepower used is disproportionate to the actual threat posed. This not only leads to unnecessary expenditure of resources but also can impact operational sustainability and effectiveness.

Using excessive firepower against minor targets can detract from the overall mission efficiency, as attention and resources are misallocated. Instead of focusing on more significant threats or strategic objectives, the unit is consumed with responding to lesser threats, leading to wasted ammunition and potentially compromising future engagements where limited resources might be necessary.

The other scenarios, while they may involve the use of firepower or resource management, do not inherently involve the phenomenon of overkill. Ensuring maximum firepower and effectively checking an enemy advance suggests an appropriate application of force, while conserving resources is aligned with prudent military strategy to maintain capability for future operations.