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Old 11-14-20, 10:58 PM   #26
Sniper297
The Old Man
 
Join Date: Dec 2005
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"did you catch the date on the report? a lot of good it did our skippers and crews during the war!"

Only thing I could find with a quick search, pretty sure it was known during the war, especially when some of the marus started dropping depth charges by rolling them off the stern. IJN ASW started out kinda lame, got a lot better toward the end of the war, including new tech like magnetic anomaly detectors and infra-red carried in ASW aircraft. Better coordination between planes and destroyers too, which was how they got the Wahoo. Gotta remember that a lot of that stuff wasn't documented because it was classified top secret during the war.
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