World War II

World War II, also referred to as The Second World War and regularly shortened to WW2 or WWII, was the conflict that saw the first usage of nuclear weapons, the establishment of the United States as a superpower, and the formation of the United Nations.

WWII-era technology
Several examples of World War II-era weapons and vehicles make appearances throughout the Fallout series, having survived the Great War of 2077:
 * The Master's nuclear bomb in the original Fallout appears to be modeled on Trinity, the first American atomic bomb, which was developed and tested late in the war.
 * The Tank in Fallout Tactics is a modified version of a WWII-era tank, the M4 "Sherman".
 * Two WWII-era aircraft, the P-51 Mustang and B-29 Superfortress, make appearances in Fallout 3 and Fallout: New Vegas.
 * Several WWII-era weapons can be found scattered about the wastelands as well. These include the M1 Garand, the Thompson submachine gun, and the M3 "Grease Gun".
 * MG 42s, the light machine gun of Nazi Germany, are a semi-common mid-tier weapon in Fallout 76.

Mentions

 * Images depicting events in World War II appear in the Fallout intro, and the war, especially as the setting for the first use of nuclear weapons, is often alluded to throughout the series.
 * In the Museum of History, there is a World War II exhibit, although it is inaccessible due to a collapsed ceiling blocking the entrance.
 * Abraham Washington is in possession of the United States' 1941 declaration of War on Germany.
 * The China Burma India Theater patch is on the Boomer flightsuit.
 * An image of the Reichstag in Berlin, Germany is seen in the original Fallout intro.
 * It is mentioned on the naval placard in the Museum of Technology
 * Attack on Pearl Harbor
 * The bombing of Hiroshima and Nagasaki in 1945.
 * GENDISK.MSG
 * Battle of Iwo Jima

Behind the scenes

 * The Sierra Army Depot was originally constructed as a location for wartime equipment storage in 1942.
 * The Anchorage Memorial is based on an iconic image from World War II.
 * The "Fat Man" is named after the atomic bomb that was dropped on Nagasaki, Japan in August 1945. Additionally, the Megaton atomic bomb is modeled after the actual bomb itself.
 * Executive Order 99066, Turtledove Detention Camp, and Little Yangtze are references to Executive Order 9066, which resulted in the internment of Japanese-Americans during World War II.