Actually, you need to be updated.
They have purchased at least 1.8 billion rounds. Most of it is .40 S&W hollow points for their pistols and submachine guns and .223/5.56 (for those "nasty" AR-15s and their full auto versions), with a fair amount of .308 for their sniper's rifles and a smattering of other calibers for the few agencies that have not standardized on the previously listed calibers.
It is NOT military ammo, but hollow points, which are illegal for use in international war per treaty.
They are clearly preparing for war against US.