"After a long search for a better way to stop extreme bleeding, the U.S. Army has purchased more than 400,000 bandages made from chitosan, a polysaccharide extracted from the exoskeletons of Icelandic shrimp."

Another cool thing about Chitosan: it's a carbohydrate, so people that are allergic to shrimp can use it, since the proteins are the culprit of a histamine reaction. link