The moon is a natural satellite that orbits around Earth, and is the planets only natural satellite.
The United States Air Force, on July 16th, 1969, utilized a Virgo II lunar lander that they had dubbed the Valiant 11, in order to land a manned team on the Moon; this made them the first human beings to have ever accomplished such a feat. On November 14th of that same year, a Virgo III lander that was dubbed the Valiant 12 landed on the Moon, with its accompanying astronauts leaving the national flag of the United States on its surface before their imminent departure.
In 2020, the Delta IX series of rockets were commissioned by the United States Space Administration, all of which underwent subsequent missions to the Moon. In 2052, the final manned mission to the Moon took place, and during this momentous occurrence, the flag left by the Valiant 12 team was recovered and brought back to Earth, where it was placed on display at Washington, D.C.'s Museum of Technology.
At an unknown point in history, the Sea of Tranquility Conflict was instigated on the moon. While the United States fought in this obscure war against unknown enemies, its conclusion has been lost to history.
|The following is based on Van Buren and has not been confirmed by canon sources.|
Boulder Dome ran controlled scenarios back on Earth for the eventual colonization and terraforming of the moon. It is unknown as to whether or not they completed any successful colonization on the moon itself.
|End of information based on Van Buren.|
The phases of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth. The lunar phases gradually and cyclically change over the period of a synodic month (about 29.53 days), as the orbital positions of the Moon around Earth and of Earth around the Sun shift. In all first-person Fallouts, this is directly observable in the sky. Thankfully, despite wars and even the Great War, the Moon's elliptical orbit has been unaffected.
Each of the four "intermediate" lunar phases (see above) is around 7.4 days, but this varies slightly due to the elliptical shape of the Moon's orbit. Aside from some craters near the lunar poles, such as Shoemaker, all parts of the Moon see around 14.77 days of daylight, followed by 14.77 days of "night". The only phase not depicted in the picture about is the new moon which is completely dark.
The moon is in all Fallout games, but only really appears in the first-person perspective Fallout games and was going to appear in Van Buren.