All Submarines Look Alike To The USPS

Update 1950 28 Nov: Check fire. It turns out the item discussed below, while sold at and apparently licensed by the Post Office, is actually from a company called American Stamp Collectibles, so the USPS probably shouldn't be held responsible for their error.
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A submariner E-mailed with a scan of a Postmark Gallery he bought at his post office for $29.95 that honors the U.S. Navy. It has a picture of a submarine on it:

He thought the picture of the submarine didn't look like any American submarine he'd ever seen, so he did some digging, and found the picture they used on the montage:

As most submariners can tell, that's not an American boat. In fact, it's a South Korean Type 209/1200 Chang Bogo-class sub, apparently the Nadaeyung (SS 069). (The picture was originally taken from Navy NewsStand.)

Cookie has more over at his site. (Bad word warning!)