What ever happened to the settlement? As soon as you have learned the basics you are sent off to Washington with the other agents telling you they would be fine. You never hear from them or ever go back to the settlement so what happened?
There isn't anything else in the game about it, but it's fairly safe to say that it was destroyed/overrun.
SPOILERS for the endgame!
With the Tidal Basin stronghold, we see the BTSU's boat landed, you could see that it either was very similar to, or was the same, boat that was at the start of the game. If that's the case, it's safe to assume that everyone in the tutorial settlement is dead.
I have a question. Where is the tutorial settlement? I thought it look like it was in Maine or somewhere far up north, but I don't really remember it that well.