The Secret Service has established a what it is calling a "Green Zone" in the heart of Washington, D.C., with National Guard to check reasons for entry.
https://twitter.com/JackPosobiec/status/1350233681051455493
The Green Zone was a heavily fortified zone in the center of the Iraqi capital that served as the headquarters of successive Iraqi regimes. It was the administrative center for the Ba'ath Party.[1] The area was not originally home to the villas of government officials though it was the location of a number of military bases, government ministries, and presidential palaces inhabited by Saddam Hussein and his family.[2] The largest of these was the Republican Palace that was President Saddam Hussein's primary seat of power. The area is also known as Karradat Mariam so named for a locally famous woman who helped the poor people of Baghdad.
https://military.wikia.org/wiki/Green_Zone