What does the term UXO stand for?

The term UXO stands for "Unexploded Ordnance," which refers to military munitions that have been fired, launched, or otherwise released but have not exploded as intended. This includes bombs, shells, grenades, and other types of military explosives that may pose a risk to safety as they can potentially detonate if disturbed. Understanding the term UXO is critical in the context of explosive ordnance disposal, as these items often require careful handling and techniques to render them safe, preventing accidental detonations. The other options do not accurately describe this type of military munitions, making them less relevant in this context.