Civil Defense Administration

The Civil Defense Administration was an American government agency responsible for disseminating information about how to survive a nuclear bomb, as well as emergency relief in the aftermath of a nuclear war.

Background
The Civil Defense Administration existed before the Great War as a parent agency of the National Catastrophe Relief Auxiliary. One of the administration's mascots was the kid-friendly Bert the Turtle, who was featured on one of its posters practicing "Duck and Cover!" The agency advocated the use of air raid shelters during a nuclear strike.

In the interests of national security, the administration also asked banks to keep an eye out for the use of foreign currencies, such as the Chinese Yuan, as well as to trigger a silent alarm and to delay customers using such currencies as long as possible without arousing suspicion.

Appearances
The Civil Defense Administration is mentioned in Fallout 3 and its add-on Point Lookout, as well as Fallout: New Vegas concept art. Posters for the administration also appear in Fallout 4 and Fallout 76.

Behind the scenes

 * The Federal Civil Defense Administration is a real world agency.
 * Some posters of the CDA are directly inspired by real propaganda posters of the Red Army, including the 1920 Dmitrii Moor "Have you volunteered?" rendition which mirrors the CDA poster seen in-game.
 * A poster created for the administration of a man in a raincoat and CDA helmet holding a shovel asking, "Where will YOU be when the Holocaust comes?" is copied onto a slide used in a Fallout 3 loading screen.