On a scarlet octagon, points at the horizontal and vertical axis, and edged with a 1/8 inch (.32cm) scarlet border 2 1/2 inches (6.35cm) in height overall, a yellow san serif letter "H" centered, the vertical sides of which are circular, the diameter being 1 3/4 inches (4.45cm).
The stylized "H" stands for Hawaii. The eight sides of the insignia refer to the eight islands of the Hawaiian Group. The colors scarlet and yellow are the old royal Hawaiian colors.
The shoulder sleeve insignia was originally approved for the Hawaiian Department on 10 Jan 1922. It was redesignated for the Central Pacific Base Command on 25 Aug 1944. On 15 Jul 1957 the insignia was redesignated to the U.S. Army, Hawaii. The shoulder sleeve insignia was reassigned to the U.S. Army Support Command, Hawaii on 30 Nov 1972 and redesignated for the U.S. Army Garrison, Hawaii on 29 Mar 1994.