Final answer:
Input from users or automated processes in a computer system load or change the item record nomenclature, shelf life code, quantity unit pack, and demilitarization code.
Step-by-step explanation:
The item record nomenclature, shelf life code, quantity unit pack, and demilitarization code are loaded or changed by input from the user or through automated processes in a computer system.
This input can come in the form of data entry, updates made through software applications, or integration with external systems.
For example, a user can input the item record nomenclature, shelf life code, quantity unit pack, and demilitarization code manually into a database, or these fields can be automatically populated or updated through the integration with a supplier's system.