These are some bases, but they're not secret: http://militarybases.com/massachusetts/
In http://www.gamesas.com/topic/1529468-super-mutant-terriers thread, I suggested that there is a Super Mutant Fortress built inside of the former Boston University. This would also be where the SM attack dogs come from...
Even though this wouldn't be a secret in-game, the fact that Todd hasn't announced it yet would still qualify (sorry Todd!)
Eh... how should we know if there are any secret military bases around Boston? They are secret!
Yes their is, it is known as Area 15, and its information is disclosed on a need to know basis.
We're not doing the submarine thing again are we lol?
Its an obvious trap, but i'm fine due to my aluminium foil hat.
Beth can make up secret and public bases if they want. They try to be mostly faithful to our reality but since the game's set in an alternate reality anything goes.
Don't know, I'll give Obama a call and see what he says.
Goggle it like crazy and see how long it takes for the Feds to show up.
Just make one up. The pre-war United States in Fallout wasn't the same as ours.
Anything you imagine will likely be cooler than a real-life military base. I've been on plenty of them and they're really not all that exciting.
It's a Fallout game, buddy. Derelict military facilities with still functional security measures are kind of a staple.