Hawaii has many military bases, so this a category for them
Zo323. One of 7 images approaching Tunnel #1 and the tunnel door belonging to the later Battery Construction Number (BCN) 303.
Zo328. One of 7 images approaching Tunnel #1 and the tunnel door belonging to the later Battery Construction Number (BCN) 303.
Zo327. One of 7 images approaching Tunnel #1 and the tunnel door belonging to the later Battery Construction Number (BCN) 303.
Zo326. One of 7 images approaching Tunnel #1 and the tunnel door belonging to the later Battery Construction Number (BCN) 303.
Zo314. One of 3 images of concrete structure #2 NW of Battery Hulu.
Zo321. The location of Gun Battery Hulu and BCN-303 at Puu-O-Hulu
https://philippine-sailor.net/wp-content/uploads/2020/03/Zo316.jpg
