USMC MCO P10520.3B Describes a Guidon as Follows

f. The organization guidon shall be made of red wool bunting upon which insignia, letters, and numbers, as required, of gold wool bunting shall be sewn on each side. This guidon shall measure 1.83 feet on the hoist and 2.33 feet on the fly. A Marine Corps emblem consisting of eagle, globe, and anchor made of gold wool bunting, shall be placed in the center of each side of the guidon. The emblem shall measure approximately 8 1/2 inches from tip to tip of the eagle’s wings, globe 5 1/2 inches in diameter, and anchor 11 inches overall. Insert letters or numerals will be consistent in size; 1 number/letter 6 inches; 2-3 letters/numbers 4 1/2 inches; 4 or more letters/numbers 1 3/4 inches. Numerals preceding letters will be 4 1/2 inches, i.e., 1LSB C. The 1 will be 4 1/2 inches, while LSB will be 1 3/4 inches. The C will be 6 inches. Guidons will always have regimental numbers/letters in lower left and lower right corners as indicated in Figures 13, 14, and 15. Centering directly under the Marine Corps emblem is not permissible. There are three types of organization guidons which are described as: Letters “USMC" of single block type, 4 inches high, shall be placed centrally above the Marine Corps emblem on an arc having a radius of 60 inches.


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