Report: 12 National Guard Members Removed From Inauguration Security

Army officials identified twelve individuals with ties to right-wing militia groups or extremist views, but they were not considered a threat to the president-elect. Following the Capitol insurrection, defense leaders expressed concerns about potential attacks by military members at the inauguration. Authorities are vetting approximately 25,000 troops assigned to the event to ensure security.

What was the context of the security mission mentioned in the text?

How did officials assess the threat level posed by the individuals with extremist views?