High Quality Content by WIKIPEDIA articles! An oak leaf cluster or oakleaves is a common device which is placed on U.S. military awards and decorations (and those of some other nations) to denote those who have received more than one bestowal of a particular decoration. The number of oak leaf clusters typically indicates the number of subsequent awards of the decoration. A bronze oak leaf cluster is worn to denote award of the second and subsequent awards of the same decoration. A silver oak leaf cluster is worn instead of five bronze oak leaf clusters. Both oak leaf clusters, regardless of medal material, come in two sizes: 13/32 inch (1.03cm) long for the full size suspension ribbon, and 5/16 inch (.79cm) long for the service ribbon bar. The design for each size and material is the same -- a twig of four oak leaves with three acorns on the stem The 5/16 inch (.79cm) oak leaf clusters joined together in series of 2, 3, and 4 clusters (sometimes referred to as "single constructed") are authorized for optional purchase and wear of service ribbons and unit award emblems.