Chrysler Hemi-powered air raid siren

I remember hearing those sirens in my youth! We had daily drills during the Cuban Missile Crisis and afterwards the sirens were tested on the first Friday of every month at 10:00 AM well into the late 1970s or mid-1980s. The last time that I heard an air raid siren test was sometime around 2003 in Huntington Beach. Our plant was across the street from Naval Weapons Station Seal Beach and I thought it might have originated from there.