What resource contains the tables necessary for looking up a 12-digit packaging code?

The correct choice refers to MIL-STD-2073-1, Appendix J, because this resource provides the necessary tables and guidance for looking up the 12-digit packaging code. This standard specifically addresses packing, preservation, and marking standards that are important for ensuring the proper handling and transport of military materials. Appendix J contains vital information regarding the identification of packaging requirements and the associated codes that detail how items should be packaged for storage and shipment.

Understanding the significance of this resource is crucial for professionals engaged in defense logistics and supply chain management. It ensures consistency and compliance with military standards, thereby facilitating an effective and efficient packing process. This appendix is specifically tailored for military and defense operations, making it an essential reference to ensure that the correct packaging codes are utilized, ensuring item preservation and readiness.