What term is used to describe munitions that cause harm to personnel or damage to materials?

The term "Explosive Ordnance" is used to encompass all types of munitions that are designed to deliver explosive effects, resulting in harm to personnel or damage to materials. This category includes bombs, grenades, landmines, and other devices intended to create explosions. The primary purpose of explosive ordnance is to incapacitate or destroy enemy forces and equipment, making it a crucial component in military operations and combat scenarios.

In contrast, options like casing devices refer to the outer shell that houses the explosive material, neutralized ordnance pertains to munitions that have been rendered safe and are no longer a threat, and safety devices are mechanisms designed to prevent accidental detonation or to ensure safe handling of explosives. These terms describe specific aspects or states of munitions but do not encapsulate the broader definition of devices intended to inflict harm or damage, which is why "Explosive Ordnance" is the correct and most appropriate choice.