Have a unique challenge coin or want to show off your collection? Share here! 'The United States Military is not known for being touchy-feely. There’s not much hugging or head-patting, and superiors don’t always have the authority to offer a serviceman a raise or promotion. When a member of the Army, Navy, Air Force, Marine Corps, or Coast Guard wants to show appreciation, love, sympathy, or professional connection, they can use challenge coins.'
From the article Coin Check by 99% Invisible