United States Navy Fighter Weapons School Adversary Keeping Up Foreign Relationships You Know, The Finger Top Gun The Finger The Bird Middle Finger Challenge Coin. The aircraft featured on the coin is a Northrup Grumman F-5N of F-5F. It is similar in appearance to the T-38 Talon. This coin came from the collection of a high level officer in the USAF. Don’t miss this opportunity to add a rare challenge coin to your collection.