Since McGuire; thankfully, had roughly 15-20 some sirens undocumented, it was a lot less challenging to find undocumented siren sites in the McGuire area than in the Brunswick area.
35.4547225,-80.8325397 - FS 2001
35.4234672,-80.8601692 - FS 2001
35.3871046,-80.8137095 - FS 2001
35.5023248,-80.8135632 - FS 2001
35.4916046,-80.8384321 - FS 2001
35.5096074,-80.946505 - FS 2001 -- Unfortunately installed in someone's front yard.
35.4359628,-80.8652411 - FS 2001
35.4592107,-80.8690369 - FS 2001
Notes for Brunswick : I haven't found the supposed siren around the nuclear facility. I skimmed the proposed area to no avail. I only know (from analyzing site numbers) that there is one more siren in Oak Island. There's likely a few along or nearby NC 133 as Half Hell and Antioch don't appear to have a siren anywhere.
Now, for a few corrections on the map.
You marked a Brunswick Whelen at the Brunswick Town/Fort Anderson building as a military siren.
And finally, a few of the NPP sirens aren't labeled by manufacturer and model. A few are just "Point (insert random number here)".