Oak Leaf Cluster

noun a United States military decoration consisting of bronze or silver oak leaves and acorns awarded to anyone who has won a given medal before
Found on http://wordnetweb.princeton.edu/perl/webwn?s=Oak%20Leaf%20Cluster

Oak leaf cluster

An oak leaf cluster is a miniature metal device worn by members of the seven uniformed services of the United States on medals and ribbons issued by the United States Army, Air Force, and Department of Defense to denote subsequent decorations and awards. It is bronze or silver in appearance, formed as a twig of four oak leaves with three acorns on...
Found on http://en.wikipedia.org/wiki/Oak_leaf_cluster
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