Final answer:
In the military, oak leaf clusters are worn on service ribbons to denote additional awards or multiple instances of a specific award. Each oak leaf cluster represents a subsequent award or service period. The number of oak leaf clusters that can be worn side-by-side varies depending on the specific branch of the military and the ribbon being worn.
Step-by-step explanation:
In the military, oak leaf clusters are worn on service ribbons to denote additional awards or multiple instances of a specific award. Each oak leaf cluster represents a subsequent award or service period. When wearing oak leaf clusters on service ribbons, there is typically a limit to the number of clusters that can be worn side-by-side. This limit varies depending on the specific branch of the military and the ribbon being worn.