“Did the mayor of DC order them?”
I think only governors have the ability. But DC doesn’t really have one, so maybe Bowser.
“The District of Columbia Army National Guard is the Army component of the District of Columbia National Guard. As the District of Columbia is a federal district and not a state, the guard is placed under the authority of the President of the United States, unlike most other National Guard units which are headed by their state’s governor.”
“...
and is the only Army National Guard state-level organization activated by the President of the United States for natural and civil emergencies.[1] The Mayor of the District of Columbia may request assistance of the National Guard assets for local purposes after consulting with the President”
from: https://en.wikipedia.org/wiki/District_of_Columbia_Army_National_Guard
In addition there is the Federal Washington DC Military District, chief provider of military defense of DC.
The Washington DC mayor with the canine last name is woefully ignorant of the the limits the mayor has.