A person may not, without a license or exception, re-export any item that meets the direct product test to a destination in the national security country group (D:1), designated terrorist supporting countries (E:1), or Cuba (E:2). Additionally, foreign-made military commodities that meet the direct...
The Bureau of Industry and Security (BIS) regulates the export and re-export of commodities, software and technologies, commercial and military in nature. Some exports require a BIS license before you can ship.

For exports, reexports, or transfer (in-country) of ECCNs 5A002.z, 5A004.z, or 5D002.z, all License Exception Encryption commodities, software, and technology (ENC) requirements under 740.17 of this part must also be met for eligibility under License Exceptions NAC or ACA.

BIS may inform an exporter, re-exporter, or transferor, either individ-ually by specific notice or through amendment to the EAR, that a license is required for the export, reexport, or transfer of commodities described in ECCNs 0A504 (incorporating...

As we can see from the illustration, Export License For Re-Exports has many fascinating aspects to explore.