The adoption of the Marine Corps "Bull Dog" recieve it's origins from the tenacity of the Marines that fought, bled, and gave their lives at the battle of Belleau Wood. The Marineswould enter the battle only 5 days after commencing on June 6th.
In the highly competitive realm of military challenge coins the creation of original artwork often sets certain companies apart from the rest. Originality is critical. There are those that have it and then there are those...well that is another story