Which one is it?
They have ammo. They are not allowed to have a magazine in their mag well unless certain conditions are met first.
Q: Are the NG units in DC handpicked from Trump hating-states with Trump-hating governors?
If so, then the NG present in DC are there because they are willing to do whatever Deep State wants of them.
In which case they are no longer a National Guard.
They are a Praetorian Guard.