The key technical distinction is the absence of a rotating compressor: ramjets and scramjets rely on the vehicle's forward velocity to compress incoming air, whereas turbojets use a mechanical compressor stage. Importers should provide detailed engineering specifications and, where ambiguous, request a binding ruling from CBP before shipment.

Yes. Depending on thrust class, propellant type, and intended application, these engines may be controlled under the Commerce Control List (EAR) or the US Munitions List (ITAR). A thorough jurisdiction and classification review by a licensed export-compliance specialist is advisable before any cross-border movement.