Introducing a list. The colon is used to introduce a list of items. The bookstore specializes in three subjects: art, architecture, and graphic design. Do not, however, use a colon when the listed items are incorporated into the flow of the sentence.
Definition of medal for Students. : a piece of metal often in the form of a coin with design and words in honor of a special event, a person, or an achievement.
The Bronze star is awarded for acts of valor. A bronze service star just denotes participation in military campaigns or multiple engagements in the same campaign. It's an addition to a service medal. You've seen men in uniform with the ribon medals on their left chest I assume. Those are service metals.