Individual Ready Reserve Unit Crest (No Motto) - Sold in Pairs SBBA~Double~83828 this device on the blue

this device on the blue infantry disc was listed as the equivalent of the roundel that appeared on headgear of many European armies

Their motto is Honoris Custos

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United States Army 21st Support Brigade Unit Crest (Sustain Supply Maintain)

Individual Ready Reserve Unit Crest (No Motto) - Sold in Pairs SBBA~Double~83828 this device on the blueUnited States Army Individual Ready Reserve Unit Crest Criteria: This is the Unit Crest (Distinctive Unit Insignia) for the Individual Ready Reserve. The laurel wreath that makes up the outer edge of the crest represents the many achievements accomplished by the IRR group. Unit Crests are worn on the Epaulets of the Army Class A Uniform jacket. Note: Sold in pairs (i. e., if you order a quantity of 1 you will receive two Unit Crests).