Along with expedition leaders Meriwether Lewis and William Clark, was the corps of discovery, a specialty established unit of the United States Army. It was a diverse group. Many had previously served in the army, and a handful had valuable experience as boatmen. But only one, perhaps the most unique of the lot, was called Seaman.
You might not know his name, but without Carl Vinson, the world, and certainly the US Navy, might have been vastly different.