My uncle (National Guard) was sent to Detroit during the riots of the 60s. The thing that made him the maddest was that they weren’t allowed to have ammunition in their guns.
I spent time in the Guard and ammo was not allowed but some of us carried a loaded magazine anyway, which could be prevented if someone strictly enforced the no bullets rule by conducting searches with strict penalties.
Not having any ammo might be why the Guard is being told to not carry their highly sought-after automatic weapons in public and prone to any 2-bit mugger taking them, much less any size group of Guardsmen being stripped of their weapons by a hardened gang.