There are many possible results in Fallout 4: Far Harbor DLC. Some of them reward you with extras, some with weapons or equipment.
This not only gives you an advantage "Far Harbor Survivalist", but the meaning will double if you release from all others on the island in a completely legitimate way.
For more information about different endings and how you can get them:
[00:05] Step 1 – Overview and Nuke activation
[01:04] Step 2 – Deactive …