Beags,
The correct term is "Jar Head"...not jug head....we are talking US Marines here...kinda like the term "Bootneck" used for the Royal Marines....another take charge group of gentlemen.
....and Beags...you definitely do not understand the fighting spirit of the US Marines if you confuse it with John Wayne Hollywood film characters. But then....unless you have had the good fortune to be around those troops...one does not have the basis to comment I would suggest.
I would suggest you read up on the military campaign in Iraq...and you will no doubt take on a better appreciation for all the young men and women that fought in that...US and British. We should take our hats off to them...they all did us old farts proud and are still doing so.
Beags...don't waver now...if it was good enough for Wellington and Nelson...it must still be good.