


The origins are not clear, but it appears to be a distinctly separate weapon model from either of the pre-existing weapon models. The eastern division of the Brotherhood of Steel, based within the Prydwen, as well as the Institute, utilize another model of the Gauss rifle, never before seen across the post-War wasteland. Outside of these advanced organizations, they are sold by only a very few specialized merchants. After the Great War, they have been consistently obtained by only the most technologically advanced factions, such as the Enclave, the Brotherhood of Steel, and the New California Republic. Gauss rifles, found earlier in New California, the Capital Wasteland, and the the Mojave Wasteland, are all remnants of the pre-War model(s) that were used by the United States Armed Forces and the Chinese People's Liberation Army. In Nuka-World, Dara Hubbell establishes that the Hubologists may have originated from Dick Hubbell's genuine interactions with the Zetans, as evidenced by Hub's alien blaster. While earlier appearances may have lead to the assumption that Zetan aliens would need some kind of breathing equipment, whenever exposed to Earth's atmosphere, it is now clear that they, at least for a short time, are capable of surviving without such technology. Upon discovering the still alive Zetan, it is seen without a helmet on, and is strong enough to defend itself against the Sole Survivor.

In Fallout 4, during a random encounter near Oberland station, a Zetan recon craft is seen crashed into the earth, with its sole pilot injured, and hiding within a nearby cave. However, this is a Wild Wasteland encounter, and as such, is not canonical. The next sighting of aliens happens in the Mojave Wasteland, north of the Horowitz farmstead a recon craft had crashed into the ground, in which its crew can be seen wandering around the crash site without helmets. They are always shown wearing full suits of clothing, apparently a space suit, complete with helmet. The Zetan aliens, named as such after their mothership Zeta, marked the first live appearance of extra-terrestrials in the series, in which they became an antagonistic force towards the Lone Wanderer in the Fallout 3 add-on, Mothership Zeta. Since Fallout 1 there have been numerous encounters with aliens, dead or alive, and their technology.
