[Cybermat47]

I was wondering if you guys knew any sites or books with information about USN subs and IJN ASW. I’ve found a few sources, but I’ve yet to find one that tells me the standard doctrine of US subs, i.e. did they prefer surfaced night attacks or submerged attacks?

I’d also like to know more about the Japanese ASW. I’ve heard that it was nowhere near the level of the British, but it obviously had some effect, as 52 US subs were lost in the Pacific.

Also, did the IJN ASW ships actually have active sonar? If not, what’s that pinging noise in SH4 meant to be?