MacArthur Army Base

The  is an Enclave base in 2253.

Background
In New Canaan, in a random encounter, you will find a squad of Enclave approach you, and they will ask you the way to MacArthur Army Base. If you are hostile to them or "Wierd", they will open fire on you. The place was not going to appear in the game, but is most likely an Enclave base.

Appearances
was going to mentioned in Van Buren, the canceled Fallout 3 by Black Isle Studios.