Seriously...
Well I was at the Buffalo Naval Park and Museum at the time. But their website never mentioned anything about this little jewel:
I was on the bridge wing of the USS The Sullivans when I noticed it, boy was I surprised.
It's a Cos.Mo.S. Sea Horse 1 SDV (who ever wrote the info for the display didn't know that I think, they just called it a one man swimmer vehicle). This apparently was a civilian craft purchased by the SEALs with their discretionary funds and converted it to military use.
(Sorry for the quality of the photos, I had been crawling though the ships at the park for about five hours and I was really tired so the lighting looks a little off).