http://fallout.wikia.com/wiki/Fallout_Bible_0
Near the bottom of the page. Good news for us Enclave Fans. The oil rig was not the only HQ. Neither was Raven rock. They are stationed around the world.
I knew that world map in the oil rig represented Enclave bases...
EDIT: Same for Fallout Bible 3 (latest update with a timeline)
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From the old Thread:
Even if the remaining Enclave in the West didn't disband, this shortly after FO3 (less than 4 years), they would be withdrawn and cautious, nursing their wounds and egos in private, and becoming largely unheard of until they can replenish their numbers. Considering they prefer pure humans, or at least as pure as they can get, they wouldn't be likely to recruit from the general populace, who they consider mutants, and would spend a generation or more rebuilding their numbers from children born to the group.
Regardless, we shouldn't hear anything from the Enclave as an organization in New Vegas, though it is likely we may run into ex-Enclave NPCs, newly disillusioned deserters from a failed cause.
I Agree that the Enclave should not make a major (if any) appearance in FO:NV. What I am trying to argue is that The Enclave is not destroyed as a faction. They where beaten on the West Coast oil rig (And styles, from what I understand, Navarro holds the most advanced gear in the wastes. It has a whole bunch of soldiers, considering how many times you run into patrols trying to get to Navarro and the men actually in the base, and Vertibirds+Base defenses that could hold off almost any attack from the Brotherhood, Shi, or NCR. Otherwise what would have been holding these factions back before, considering they don't know about the oil rig.) And the Enclave moving east does not mean that the West coast Enclave would loose all their leadership. Col. Autum was probably just one of the "higher ups" the Enclave had at their disposal.
(also, the NCR and BOS would be somewhat weak at this point, They just fought a war against eachother where both sides had A LOT of losses. Moral and Men would be hard to come by for a attack on a group stronger than the BoS tech wise)
Another factor to take into regard is the fact that the Enclave could have had multiple bases. In FO2, if you are at the oil rig, on the same level as the president, the room right of the presidential office there is a map of the world. On that map there are 2 dots in California, 1 on the East Coast near DC, and many more scattered round the USA. I dont think they represent the Vaults, because there is only 1 on the East Coast near DC (while there are many vaults in FO3). If you where to look at them as Enclave bases, it would make out perfectly. 2 in Cali (Oil Rig and Navarro) and 1 on the East Coast (Raven Rock). It would not make much since either, having vault experiments on a map where you make you major strategic decisions. It would be more logical to have that information in a lab or observation terminal.
ANOTHER question to raise is: If they where sooo weak after FO2, how did they manage to create that mobile crawler + get hold of all those Vertibirds that we see flying out of RR after it is blown up? They either are not as weak as we think at Navarro or they had more bases scattered through the former nation. They even managed to create new and better Power Armor (meaning they have factories somewhere). Otherwise, it would be near impossible for them to get that equipment and manage a trek across the U.S.. It is even said that the Oil rig was only the HQ of the Enclave. That does not mean it is the only major base.
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EDIT: Found another good bit from the Fallout wiki:
http://fallout.wikia.com/wiki/Enclave (under "origins")
Cheers,
Mk II