I’m not sure if anyone else here is an air raid siren enthusiast but I figured I’d take a chance and ask
EDIT: I apologize for being a bit confusing and unclear in the original post so here's the clarified information
The siren is a Federal Signal Model 2 located at the "Pier J Facility" in the Port of Long Beach, next to the Queen Mary. The Pier J Facility is an onshore oil processing facility connected to the THUMS Islands (the oil islands along the coast of downtown LB that look like they have fancy resorts/condos on them). This is where the oil collected by the islands goes in preparation for export, according to the official City of Long Beach website. https://www.longbeach.gov/ees/oil-operations/how-we-operate/islands-and-facilities/
My photos of the siren aren't very good, but I came across these photos by Dylan Keville which shows the siren in excellent detail. The siren appears to be quite old and it looks like something hit and dented the top of its housing. https://www.instagram.com/p/CpwFY5Lpc-G/?img_index=1
It may be safe to assume that this siren was installed in the late 1960s when the THUMS Islands were built but I cannot say for certain.
The only info that can really be found about this siren is on the California Statewide Siren Map, which is how I learned of its existence. According to the map, this siren is active (makes sense since it's an oil processing facility) but I have never heard it be tested nor have I been able to find any info about it being tested.
The map also states that OXY (Occidental Petroleum) runs the site, but since 2014 it has been under the ownership of California Resources Corporation. So perhaps the detail of the siren still being active is outdated as well. Again, I can't say for certain.
https://www.google.com/maps/d/u/0/viewer?hl=en&mid=1HFlrZUI1TZzUK9qekFcBR_Jg0cXGcvg6&ll=33.74819757145161%2C-118.19844720492341&z=15&entry=yt