These were recent scans from Seattle NARA - the Charleston Access Gate at PSNS in 1943. The gate is currently here, but I don't know if this is the same location as it was in 1943, or if it was moved in or out.
The below photo was captioned "Machine gun nest protecting Charleston Gate," on the back, and there's really not enough information to locate the exact position at this point. It does not look like terribly exciting duty, but I would imagine there were a lot of sailors and Marines who enjoyed the shore duty stateside over being sent forward in the Pacific for a year or two, if not longer.
These were out of a group of records on "Passive Defense" for the shipyard, which were the same source as the Passive Defense Handbook, posted earlier.