WARNING: U.S. EXPORT CONTROL LAWS
NIJ Level III products (Rifle Protection) fall under the jurisdiction of the International Traffic in Arms Regulations (ITAR), and are subject to the export control laws of the U.S. Government. Export or retransfer of NIJ Level III products by any means to any foreign end user, or for any other end use, whether in the U.S. or abroad, without the written approval of the U.S. Department of State, is prohibited.
There is often an exemption for a U.S. person taking their personal protection with them in their luggage, and returning the armor to the US. For the requirements, click here. One of the forms required may be found here.