Custom unit coins, commonly called challenge coins, are used as awards for excellence or to commemorate an event, mission, group, etc.  Challenge coins aren't just for the Military anymore, challenge coins are great for police & fire departments, schools, retirements, businesses, clubs and many more.  Due to their collectable nature, custom coins have increased in popularity recently. They provide a unique forum in which to display your message and convey information about your agency or specialty unit.