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U.S. Army patches, insignia, and other heraldic items fall under the purview of The Institute of Heraldry. The address is:
The Institute of Heraldry 9325 Gunston Road Room S-112 Fort Belvoir, VA 22060-5579 Telephone: 703-806-4970/DSN 656-4970
You may also wish to visit their homepage: https://tioh.army.mil/