In most cases, the ammunition you buy at a gun store is not the same ammunition used by the military, unless you are buying surplus military ammo. In this case,

In most cases, the ammunition you buy at a gun store is not the same ammunition used by the military, unless you are buying surplus military ammo. In this case, the word 'surplus' is very important, as it tells us we're not talking about a military shortage caused by commercial sales. In any case, the article is mostly about artillery, tank shells, guided munitions, and so on, not small arms ammunition.