The Munitions Response Program (MRP) is charged with characterizing and, where necessary, remediating munitions-contaminated sites. During a cleanup, a site is typically mapped with a geophysical system, based on either a magnetometer or electromagnetic induction (EMI) sensor, and the locations of all signals above some detection criterion are excavated. Many of these detections do not correspond to munitions, but rather to other harmless metallic objects or geology: field experience indicates that often in excess of 95% of objects excavated during the course of a munitions response are found not to be munitions. Current technology, as it is traditionally implemented, does not provide a physics-based, quantitative, validated means to discriminate between munitions and nonhazardous items.