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 the stem. The bronze oak leaf cluster represents one additional award, while the silver oak leaf cluster is worn in lieu of five bronze oak leaf clusters.