IMHO Harbortown lighthouse is just a big billboard and is not a proper ATON.

I have been to both Leamington Range Rear on Hilton Head



and Hunting Island.



I tried to find the Parris Island one today, and I got close to the GPS location and the GPS said "Start off road navigation" and pointed straight into a dense jungle area. I did try another road that went in that direction and ended up at the airfield, but did not see it anywhere.