Which grenade is designed to inflict personnel casualties and damage light equipment?

The M67 grenade is specifically designed as an anti-personnel device, intended to produce casualties among enemy forces and cause damage to light equipment in combat scenarios. It has a spherical design and employs a high-explosive charge that creates a lethal fragmentation pattern, maximizing its effectiveness against personnel within a specified radius.

The other types of grenades mentioned serve different purposes. For instance, the MK 2 grenade, also known as the "Pineapple" grenade, was designed for similar purposes but is an older model that has been largely phased out in favor of modern equivalents like the M67. The M84 is a stun grenade designed primarily for distraction and disorientation rather than causing lethal injuries. The AN-M14 Thüring grenade serves a different role as well, being primarily used in specialized operations rather than general combat scenarios.

Consequently, the M67 stands out as the optimal choice for inflicting personnel casualties and damaging light equipment directly due to its purpose-built design and functionality.