Quantico Base Challenge Coin This 1 5/8" antique brass challenge coin features the previous Quantico Base logo between two raised Eagle, Globe, and Anchors, and is flanked by the words, "Marine Corps Base Quantico" and "Crossroads of the Marine Corps." This side is covered with a protective clear epoxy coating. The reverse side features a 3D Eagle, Globe, and Anchor and the text, "United States Marine Corps" and "Semper Fidelis."