Oak leaf clusters may be worn on United States Army, Air Force, and Department of Defense decorations and awards presented to members of the seven uniformed services: the Army, Navy, Marine Corps, Air Force, Coast Guard, Public Health Service, and the NOAA Commissioned Corps.
Except for the Air Medal, unique decorations issued by the Army or Air Force, and those decorations and awards issued by the Department of Defense, the other uniformed services use 5/16 inch stars to indicate subsequent awards.