The USML identifies those items or categories of items considered to be defense articles and defense services subject to export control. The USML is similar in coverage to the International Munitions List (IML), but is more restrictive in two ways. First, the USML currently contains some dual-use items that are controlled for national security and foreign policy reasons (such as space-related or encryption-related equipment). Second, the USML contains some nuclear-related items. Under Presidential directive, most dual-use items are to be transferred from the USML to the Commerce Department's dual- use list. State, with the concurrence of Defense, designates which articles will be controlled under the USML. Items on the Munitions List face a stricter control regime and lack the safeguards to protect commercial competitiveness that apply to dual-use items.

This definition is in context to Shipping. See more contextual defintions for U.s. Munitions List.