Mil-Std-129 is a set of rules that the government made up to make sure that all products that they buy from companies can be tracked and accounted for. It is like a special code or label that is put on boxes or packages so that people can easily tell what is inside and where it came from.
Think about a big toy box that has a lot of toys inside. If you want to know which toy is inside the box, you need to have a special label or code to help you identify it. Mil-Std-129 works the same way, where each product or item has a unique code that helps people to identify it quickly.
These codes will also show important information like where the product came from, how it was made, and what it is used for. This helps people to keep track of the products they buy or sell and helps them to know if something is wrong with the product.
Overall, Mil-Std-129 helps people to quickly and easily identify and track products using a special code or label that is put on packages.