Unexploded ordnance (UXO) is any military munitions or explosive ordnance that remains unexploded by malfunction or design.

Unexploded Ordnance (QCMR-1)
Section 1 (Introduction)
This document highlights the products and performance standards required for all geophysical surveys, explains the decision logic used for an MR project and offers resources for planning and monitoring QA/QC activities to ensure quality data and confidence in decisions.  Using this guidance, regulators and stakeholders can quickly review MR project work plans, evaluate the quality of MR work performed, and identify quality goals, steps, and metrics. 

Unexploded Ordnance (UXO-6)
Section 1 (Introduction “A Note on Terminology”)
FAQ provides information about wide-area assessments for munitions response areas (MRA) known or suspected to contain unexploded ordnance, discarded military munitions, or munitions constituents.  An MRA comprises of one or more munitions response sites (MRS).