Oak Leaf Clusters
A bronze or silver twig of four oak leaves with three acorns on the stem, 13/32 inch (1.03cm) long for the suspension ribbon, and 5/16 inch (.79cm) long for the service ribbon bar and the unit award emblem is issued to denote award of second and succeeding awards of decorations (other than the Air Medal), the Army Reserve Components Achievement Medal, and unit awards. A silver Oak Leaf Cluster is worn instead of five Bronze Oak Leaf Clusters. Oak Leaf Clusters are not issued for the Legion of Merit awarded in degrees to foreign nationals. The 5/16 inch (.79cm) Oak Leaf Clusters joined together in series of 2, 3, and 4 clusters are authorized for optional purchase and wear of service ribbons and unit award emblems.