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While the bunker is sealed and mostly abandoned, it has managed to remain hidden and out of the control of outside forces. The first and least likely potential base is the remnants bunker from Fallout New Vegas in the Mojave Wasteland. Fortunately, there are three exceptions to this. However, by 2278 almost of the potential bases that we have heard of have been either destroyed or occupied by powerful enemy forces. Raven Rock, the mobile base crawler, and the oil rig were all major examples of this. In every game they have appeared in, they have always used some prewar bunker or fortress as their base of operations, often equipped with top of the line technology. While we have no actual proof of where they might have went, we can use their previous behavior to make an estimated guess. This leaves them with two options: head back west or south. Believing that they are America’s “best hope” it is unlikely they would leave the US to regroup across the ocean in Europe (not to mention that they would probably not have the resources left to move a large amount of troops across an entire ocean).
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This raises the question of if they managed to stick together, where did they go? Since the only mention of the Enclave in Fallout 4 was in the Brotherhood of Steel terminals, it’s likely that they didn’t head north to attempt to gain control of the technological hotspot of the Commonwealth. At this point, we can assume that they are quite skilled at remaining organized and rebuilding their forces even after suffering heavy losses. Their losses are much larger even if you consider the larger outposts they also lost, such as the Jefferson Memorial. Less than a full year after arriving in the Capital Wasteland both their primary base at Raven Rock and contingency base at Adams Air Force base are destroyed by Lone Wanderer. First their off shore oil rig to the Chosen One, then they lost Navarro to the NCR four years later. In the 36 year period between the start of Fallout 2 and end of Fallout 3 (2242-2278) the Enclave suffered major losses at their own base of operations. If there is one thing that we know about the Enclave, it’s that they have the survival skills of a roach.
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While it is possible that after the destruction of the mobile base crawler at Adams Air Force Base, the remaining Enclave forces could have just scattered into the wasteland, it is unlikely. However, due to unlikely sources, I have a theory about their fate following their defeat in DC in 2278. Although by the events of Fallout 4, a decade after their defeat, we don’t have a clear answer to what happened to the Enclave after they lost the Brotherhood-Enclave War. Regardless of the player’s choices in Fallout 3, we know for a fact that the Lyons Brotherhood of Steel managed to defeat the Enclave and drive them out of the Capital Wasteland.
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