What is United States Munitions List?

Legal Definition
The United States Munitions List (USML) is a list of articles, services, and related technology designated as defense- and space-related by the United States federal government. This designation is pursuant to sections 38 and 47(7) of the Arms Export Control Act (22 U.S.C. 2778 and 2794(7)). These articles fall under the export and temporary import jurisdiction of the Department of State.

The USML is found in Part 121 of Title 22, Foreign Relations, of the Code of Federal Regulations (CFR). The Directorate of Defense Trade Controls (DDTC) administers the regulations. The USML is amended by rules published in the Federal Register. Further information and clarification whether specific articles or services fall under the USML are periodically discussed in Defense Trade News published by the State Department's Bureau of Political-Military Affairs.

Any article, service, or related data found to be on the USML requires an export license issued by the United States State Department to be exported (given to a non-U.S. person). A "U.S. person" is a U.S. citizen or permanent resident who does not work for a foreign company, government, or non-governmental organization. Some license exceptions are available under specific circumstances.

Exports of products not covered by the USML are most likely subject to the export jurisdiction of the United States Department of Commerce, Bureau of Industry and Security (BIS). Numerous other Federal Agencies have their own niche export control regulations, e.g. DOE, FDA, NNSA, NRC, USDA/APHIS, USFWS, etc.. The first step in exporting a Commerce Control List (CCL) item under the BIS regulations is to identify the Export Control Classification Number (ECCN).
-- Wikipedia
Legal Definition
The United States Munitions List is a list of defense articles, services and related technical data designated as such by the federal government. These defense items are controlled by the Arms Export Control Act. The List is divided into twenty-one categories of defense articles, ranging from firearms to nuclear weapons. The United States Munitions List can be found in Part 121 of the International Traffic In Arms Regulations (ITAR).