This bill, titled the "Defining Humanitarian Demining Assistance Act of 2025," seeks to amend section 407 of title 10, United States Code. Its primary purpose is to revise and clarify the definitions of humanitarian demining assistance and stockpiled conventional munitions assistance . These updated definitions aim to provide more comprehensive guidance for related training and support activities. For humanitarian demining assistance , the bill specifies that it includes the detection and clearance of landmines, unexploded explosive ordnance, and other explosive remnants of war. It further details activities such as education, training, technical assistance, and infrastructure development, all aligned with the competencies prescribed by the International Mine Action Standards. This also covers the development of national standards and procedures, as well as explosive safety. Regarding stockpiled conventional munitions assistance , the legislation defines it as training and support for the disposal, demilitarization, physical security, and lifecycle management of potentially dangerous stockpiles. This includes explosive ordnance, small arms, and light weapons, such as man-portable air-defense systems. The assistance is to be provided in accordance with International Ammunition Technical Guidelines to support the capacity building of foreign security institutions.