Special Forces DE OPPRESSO LIBER Crest Insignia - Pin Closure. 1st Special Forces Insignia. DUI #D-3397. Dimensions: 1" x 1 1/8". ** This item is manufactured by a U.S. factory certified by The Institute of Heraldry. ** California Proposition 65 WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects and other reproductive harm.