What can a soldier do to protect federal property or personel that is not law enforcement? Manual labor to throw up barriers seems to be the only option. Anythi

What can a soldier do to protect federal property or personel that is not law enforcement? Manual labor to throw up barriers seems to be the only option. Anything else requires violence, which only law enforcement can do legally I thought. Unless perhaps they intend to 'use self defense'. But intent kinda defeats self defense.