Heraldry
Shoulder Sleeve Insignia
Description: On a yellow shield with a 1/8 inch (.32cm) blue border 2 9/16 inches (6.51cm) and 2 inches (5.08cm) in width overall, a blue millrind throughout.
Symbolism
The millrind is the iron reinforcement fixed in the center of a millstone to support the stone as it revolves on its axle when grinding wheat. It is used in heraldry as a symbol of support. With the additional reference to wheat, the "staff of life", the millrind stands for the vital and varied support furnished by the organization.
Background
The shoulder sleeve insignia was originally approved on 11 Feb 1966 for the 1st Support Brigade. On 15 Oct 1976 it was redesignated for the 21st Support Command.