What does UXO stand for?

The term UXO stands for "Unexploded Ordnance." This refers to military munitions that did not detonate as intended during combat operations or training exercises and remain hazardous. Understanding this definition is crucial, as UXO presents serious safety risks to civilians and military personnel alike, especially in post-conflict areas where these devices can lie undetected for years. The other options presented—Unidentified Ordnance, Unused Ordnance, and Unauthorized Ordnance—do not capture the specific dangers and implications associated with munitions that failed to explode, which is essential knowledge in UXO management and safety protocols.