“Military grade” means “made by the cheapest contractor available, using sub-par materials, to juuuuuust meet the bare minimum requirements set by the government”.

It’s like when housing developers advertise that all of their houses are “built to code”. Congrats, building code is the bare minimum requirement for the house to be considered habitable. It needs to be up to code to be able to sell. Someone advertising that a house is “built to code” is saying “we would build this worse if we were legally allowed to do so, but the law says we weren’t allowed to cut any more corners and still pass an inspection.”