I’m on dial-up service so I can’t watch the video but reading the comments I assume it’s one of our systems. Like I said the one I saw was impressive. Also I’ll add to that most of our ships to not fully rely on it as their sole anti aircraft defense.
I casually thought they were pulling them off ships for some newer systems.
I know they replaced the pom-pom guns (Bofors) on the battleships at the time.