That's fictional. No American submarine fought with any kind of dazzle camo during the war. However, my S-boat routinely sports a really nice blue dazzle paint camo for fun and I run kill flags and the shark mouth on my USS Kraken Balao.
It adds a sense of ownership to your boat and the stupid computer AI can't see it, so I can't see any reason not to use any graphical device to increase your sense of identification with your boat. Anyway, it adds to the fun.
