Fragmentation grenades are primarily used for which purpose?

Fragmentation grenades are primarily designed to inflict personnel casualties. This type of grenade is filled with explosive material that, upon detonation, disperses shrapnel over a large area, aimed at personnel rather than equipment or other targets. The shrapnel can cause serious injury or death to individuals within its effective radius, making it a weapon specifically oriented towards anti-personnel tactics in combat situations.

While other options like marking targets, destroying equipment, and providing light are valid methods for different types of ordnance or tools, they do not align with the primary function of fragmentation grenades. The main focus of these grenades is to incapacitate or eliminate enemy forces, reinforcing their role in combat scenarios where personnel engagement is critical.