If the delegation of authority to the subagent is not authorized, the principal is not liable to third persons for any act or contract of the subagent.
The types of vaccines the government will accept include those approved or authorized for emergency use by the U.S. Food and Drug Administration, and the shots that have an emergency use listing from the World Health Organization.
There will be as many as 25,000 National Guard troops on hand for inauguration day -- at least that's how many the Pentagon has authorized for the job of keeping the event secure.