"Jarhead" - A slang term used by sailors as early as World War II to refer to members of the Marine Corps, drawing the term from the resemblance of the Marine dress blues uniform, with its high collar, to a Mason jar which at the time was made from blue glass.

Being a "squid" I like this part of USMC history the best, "In 1834 the marines became part of the Department of the Navy."

MM, you might like this site:

www.montney.com/marine/brief.htm