Looks like a Japanese decoration to me. Very distinct style, like the one that adorned many Japanese officers' uniforms-Tojo, Yamamoto etc.

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"GARRY OWEN"-Traditional war-cry of the US 7th Cavalry.
"CURRAHEE"-War-cry of the US 506th PIR.
"Everybody thinks that they are going to get the chance to punch some Nazi in the face at Normandy-and those days are over, they are long gone"-Lt Chris Burnett