U.S. Marine Corps Chemical Biological Incident Response Force (CBIRF) challenge coin featuring “Fighting The Unseen Enemy” and the CBIRF motto “Certo Occultus Hostis.” Unique shaped design features the CBIRF emblem with chemical/biological/radiological imagery on one side and a protective gas mask design on the reverse. Large, heavy military challenge coin measuring approximately 2.5" tall. Pre-owned with light surface wear as shown. Please review photos for exact condition.