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The Department of Defense (DoD) developed the advanced geophysical classification for munitions response process (hereafter referred to as advanced geophysical classification, or AGC) to improve the efficiency and effectiveness of munitions cleanup.1 AGC represents a major change in how munitions cleanup is conducted. DoD and its partners have identified several advantages in using AGC over other technologies, including greatly improved performance at detecting and identifying munitions and explosives of concern (MEC) resulting in faster investigation and remediation; higher data quality and greater confidence under its accreditation process, which promotes State acceptance of the data; and less invasive fieldwork (fewer digs) due to the in-situ detection and classification of objects. In order for the DoD to regularly apply this technology at Munitions Response Sites (MRSs), State regulators must have an understanding and acceptance of AGC.