U.S. Marshals Service The Marshals Service provides security to the federal judiciary, and manages the witness security program. It manages and sells seized or forfeited assets of criminals, is responsible for the confinement and transportation of federal prisoners who have not been turned over to the Bureau of Prisons, and is the primary federal agency responsible for fugitive investigations.
I didn't see anything about guarding the capitol during the inauguration. So deputizing troops begs the question - what is their mission and how does support the DOJ and federal Judiciary. Who are they there to seize or arrest.
".... Who are they there to seize or arrest?...."Stop and think about it for a second. It's not a hard question to answer.
Think outside the MSN spin box.