Apparently, we have a special force in the military, maybe similar to the National Guard in each state, and it is solely responsible for protecting Washington DC, and the government functions there. If there was an attack of some kind, and the president and congress had to be evacuated, this is who would take care of it, and than make sure that all of DC was secure. An interesting thing, is that they have now been activated because of the covid-19 epidemic (or at least that is the given reason), in case they are needed . This is basically a secret Special Task Force that we never hear about. https://www.newsweek.com/exclusive-...t-military-task-force-prepares-secure-1498276