This plaque, embedded in a large old slab, is located on the Embarcadero. You’ll find it right next to the USS Midway Museum, at the north end of the Greatest Generation Walk. It remembers the victims of the surprise attack on Pearl Harbor on December 7, 1941.
IN MEMORY OF THE 2335 MEN WHO PERISHED IN THE SERVICE OF THEIR COUNTRY ON THE ISLAND OF OAHU.
It looks like the memorial was unveiled by a local chapter of the Pearl Harbor Survivors Association in 1984. I’m not sure where the plaque was located originally. I searched the internet briefly, but found nothing.
I’ve learned that this plaque was originally located on the Broadway Pier, prior to its renovation a few years ago. This post contains more info I received from the Port of San Diego.