We live in a scary world. We have to protect our country, particularly when it comes to exporting defense-related products including weaponry and military equipment (and components, parts, accessories, etc.) to other countries.
By regulating the export of these products, the U.S. State Department’s Directorate of Defense Trade Controls (DDTC) helps protect U.S. national security so this sensitive information and technology does not get into the wrong hands. Details are found primarily within the International Traffic in Arms Regulations (ITAR).