Hedgehogs came with the stock release and in Fact were featured in one of the first game play teaser videos ever posted online.
Here the hedgehogs can be seen around half way into the video.
This is one of the first ever seen gameplay footage videos featured at E3 in 2004... Almost 12 years ago... Unbelievable it has been that long.
I remember when I got my first copy. Like it was yesterday
Edit: you'll have to note that hedgehogs came into use in 1942. In SH3 they will not be commonplace aboard many destroyers until late 42 early 43
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