ITAR is for export and import. If you conduct business with only U.S. Citizens in the United States ITAR is not applicable. If you even give a foreign national information or a U.S. Citizen working for a foreign owned firm or as an agent of a foreign national you have made an export. An export does not have to be a product it can also be information knowingly given or not. When it comes to arms related stuff such as bullet jackets etc ITAR comes in to play and is under the State Department. So as far as selling jackets or bullets for a business is concerned Either get an export license or do not do business that requires an export.