http://www.americanmilitaryforum.com/forums/threads/special-missions-craft-demystefied.1059/
http://foxtrotalpha.jalopnik.com/unmasking-the-columbia-rivers-mysterious-stealth-boats-1583093889
http://www.hisutton.com/SEALION%20and%20Alligator%20stealth%20boats.html
http://dambiev.livejournal.com/868483.html
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